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प्र: Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is ? 1371 0

उत्तर : 4. "3 : 2"
व्याख्या :
Answer: D) 3 : 2 Explanation: Let the speeds of the two trains be x m/sec and y m/sec respectively. Then, length of the first train = 27 x meters, and length of the second train = 17 y meters. (27 x + 17 y) / (x + y) = 23 => 27 x + 17 y = 23 x + 23 y => 4 x = 6 y => x/y = 3/2.

प्र: Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ? 1707 0

उत्तर : 1. "5"
व्याख्या :
Answer: A) 5 Explanation: Let the number be x. Then, 3x2 - 4x = x + 50 3x2- 5x - 50 = 0 (3x + 10)(x - 5) = 0 x = 5

प्र: P is faster than Q. P and Q each walk 24 km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, P's speed is equal to ? 4215 0

उत्तर : 2. "4 km/hr"
व्याख्या :
Answer: B) 4 km/hr Explanation: Let P's speed = x km/hr. Then, Q's speed = (7 - x) km/ hr. So, 24/x + 24/(7 - x) = 14 x2 - 98x + 168 = 0 (x - 3)(x - 4) = 0 => x = 3 or 4. Since, P is faster than Q, so P's speed = 4 km/hr and Q's speed = 3 km/hr.

प्र: When 0.46 is written in simplest form, the sum of the numerator and the denominator is ? 2116 0

उत्तर : 2. "73"
व्याख्या :
Answer: B) 73 Explanation: 0.46 = 46/100 = 23/50. Sum of the numerator and denominator is 23 + 50 = 73

प्र: A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days ? 1691 0

उत्तर : 3. "13 days"
व्याख्या :
Answer: C) 13 days Explanation: Ratio of times taken by A and B = 100 : 130 = 10 : 13.Suppose B takes x days to do the work. Then, 10 : 13 :: 23 : x => x = ( 23 x 13/10 ) => x = 299 /10. A's 1 day's work = 1/23 ;B's 1 day's work = 10/299 . (A + B)'s 1 day's work = ( 1/23 + 10/299 ) = 23/299 = 113 . Therefore, A and B together can complete the work in 13 days.

प्र: The second day of a month is Sunday, What will be the last day of the next month which has 31 days ? 6950 0

उत्तर : 4. "Can't be determined"
व्याख्या :
Answer: D) Can't be determined Explanation: We cannot find out the answer because the number of days of the current month is not given.

प्र: Vishal and Raghu jointly started a business. Vishal invested three times as Raghu did and invested his money for double time as compared to Raghu. Raghu earned Rs. 4000. If the gain is proportional to the money invested and the time for which the money is invested then the total gain was ? 1780 0

उत्तर : 1. "Rs. 28,000"
व्याख्या :
Answer: A) Rs. 28,000 Explanation: Investments ratio is = 3:1Time period ratio is = 2:1 As they are proportional to gain ------Gain ratio of Vishal and raghu = 6:1 But given Raghu got Rs. 4000, =? 1 ----- 4000 7 ----- ? => Rs.28,000 The total gain = Rs.28,000

प्र: 10 boys can complete a work in 7 days and 10 girls take 14 days to complete the work. How many days will 5 boys and 10 girls take to complete the work ? 1253 0

उत्तर : 3. "7 days"
व्याख्या :
Answer: C) 7 days Explanation: 1 boy's 1 day work = 1/70 1 girl's 1 day work = 1/140 (5 boys + 10 girls)'s 1 day work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7 5 boys and 10 girls will complete the work in 7 days.

प्र: Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is ? 1371 0

प्र: Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ? 1707 0

उत्तर : 1. "5"
व्याख्या :
Answer: A) 5 Explanation: Let the number be x. Then, 3x2 - 4x = x + 50 3x2- 5x - 50 = 0 (3x + 10)(x - 5) = 0 x = 5

प्र: P is faster than Q. P and Q each walk 24 km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, P's speed is equal to ? 4215 0

प्र: When 0.46 is written in simplest form, the sum of the numerator and the denominator is ? 2116 0

उत्तर : 2. "73"
व्याख्या :
Answer: B) 73 Explanation: 0.46 = 46/100 = 23/50. Sum of the numerator and denominator is 23 + 50 = 73

प्र: A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days ? 1691 0

प्र: The second day of a month is Sunday, What will be the last day of the next month which has 31 days ? 6950 0

उत्तर : 4. "Can't be determined"
व्याख्या :
Answer: D) Can't be determined Explanation: We cannot find out the answer because the number of days of the current month is not given.

प्र: 10 boys can complete a work in 7 days and 10 girls take 14 days to complete the work. How many days will 5 boys and 10 girls take to complete the work ? 1253 0

उत्तर : 3. "7 days"
व्याख्या :
Answer: C) 7 days Explanation: 1 boy's 1 day work = 1/70 1 girl's 1 day work = 1/140 (5 boys + 10 girls)'s 1 day work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7 5 boys and 10 girls will complete the work in 7 days.

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प्र: Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is ? 1371 05b5cc6dfe4d2b4197774eac1

प्र: Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ? 1707 05b5cc6dfe4d2b4197774eabc

उत्तर : 1. "5" व्याख्या :Answer: A) 5 Explanation: Let the number be x. Then, 3x2 - 4x = x + 50 3x2- 5x - 50 = 0 (3x + 10)(x - 5) = 0 x = 5

प्र: P is faster than Q. P and Q each walk 24 km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, P's speed is equal to ? 4215 05b5cc6dfe4d2b4197774eab7

प्र: When 0.46 is written in simplest form, the sum of the numerator and the denominator is ? 2116 05b5cc6dee4d2b4197774ea9e

उत्तर : 2. "73" व्याख्या :Answer: B) 73 Explanation: 0.46 = 46/100 = 23/50. Sum of the numerator and denominator is 23 + 50 = 73

प्र: A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days ? 1691 05b5cc6dee4d2b4197774ea99

प्र: The second day of a month is Sunday, What will be the last day of the next month which has 31 days ? 6950 05b5cc6dee4d2b4197774ea94

उत्तर : 4. "Can't be determined" व्याख्या :Answer: D) Can't be determined Explanation: We cannot find out the answer because the number of days of the current month is not given.

प्र: 10 boys can complete a work in 7 days and 10 girls take 14 days to complete the work. How many days will 5 boys and 10 girls take to complete the work ? 1253 05b5cc6dee4d2b4197774ea85

उत्तर : 3. "7 days" व्याख्या :Answer: C) 7 days Explanation: 1 boy's 1 day work = 1/70 1 girl's 1 day work = 1/140 (5 boys + 10 girls)'s 1 day work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7 5 boys and 10 girls will complete the work in 7 days.

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

त्रुटि की रिपोर्ट करें

प्र: Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is ? 1371 0

प्र: Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ? 1707 0

उत्तर : 1. "5"
व्याख्या :
Answer: A) 5 Explanation: Let the number be x. Then, 3x2 - 4x = x + 50 3x2- 5x - 50 = 0 (3x + 10)(x - 5) = 0 x = 5

प्र: P is faster than Q. P and Q each walk 24 km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, P's speed is equal to ? 4215 0

प्र: When 0.46 is written in simplest form, the sum of the numerator and the denominator is ? 2116 0

उत्तर : 2. "73"
व्याख्या :
Answer: B) 73 Explanation: 0.46 = 46/100 = 23/50. Sum of the numerator and denominator is 23 + 50 = 73

प्र: A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days ? 1691 0

प्र: The second day of a month is Sunday, What will be the last day of the next month which has 31 days ? 6950 0

उत्तर : 4. "Can't be determined"
व्याख्या :
Answer: D) Can't be determined Explanation: We cannot find out the answer because the number of days of the current month is not given.

प्र: 10 boys can complete a work in 7 days and 10 girls take 14 days to complete the work. How many days will 5 boys and 10 girls take to complete the work ? 1253 0

उत्तर : 3. "7 days"
व्याख्या :
Answer: C) 7 days Explanation: 1 boy's 1 day work = 1/70 1 girl's 1 day work = 1/140 (5 boys + 10 girls)'s 1 day work = (5/70 + 10/140) = (1/14 + 1/14) = 1/7 5 boys and 10 girls will complete the work in 7 days.