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प्र: Amar can do a piece of work in 10 days. He works at it for 4 days and then Arun finishes it in 9 days. In how many days can Amar and Arun together finish the work ? 5861 0

उत्तर : 4. "6 days"
व्याख्या :
Answer: D) 6 days Explanation: 4/10 + 9/x = 1 => x = 15 Then both can do in 1/10 + 1/15 = 1/6 => 6 days

प्र: A train 125 m long passes a man, running at 4 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is: 1656 0

उत्तर : 1. "49 kmph"
व्याख्या :
Answer: A) 49 kmph Explanation: Speed of the train relative to man = (125/10) m/sec = (25/2) m/sec. [(25/2) x (18/5)] km/hr = 45 km/hr. Let the speed of the train be 'x' km/hr. Then, relative speed = (x - 4) km/hr. x - 4 = 45 => x = 49 km/hr.

प्र: The cost price of an article is 54% of the marked price. Calculate the gain percent after allowing a discount of 15% ? 1630 0

उत्तर : 3. "48.4 %"
व्याख्या :
Answer: C) 48.4 % Explanation: Let marked price = Rs. 100. Then, C.P. = RS. 54, S.P. = Rs. 85Gain % = 31/64 x 100 = 48.4%.

प्र: A 260 m long train running at the speed of 120 km/hr crosses another train running in opposite direction at the speed of 80 km/hr in 9 sec. What is the length of the other train ? 1484 0

उत्तर : 1. "240 mts"
व्याख्या :
Answer: A) 240 mts Explanation: Relative speed = 120 + 80 = 200 km/hr.= 200 x 5/18 = 500/9 m/sec. Let the length of the other train be L mts.Then, (L + 260)/9 = 500/9 => L = 240 mts.

प्र: At what rate percent on simple interest will Rs.415 amount to Rs.514 in 4 years ? 1415 0

उत्तर : 2. "5.96 %"
व्याख्या :
Answer: B) 5.96 % Explanation: Difference in amount = 514 - 415 = 99 99 = (415 x 4 x R)/100 R = 5.96%

प्र: Calender Puzzle 1608 0

उत्तर : 4. "D"
व्याख्या :
Answer: D) D Explanation: We can't determine the last day of the next month which has 31 days because we don't know the days in present month which may be 30 or 31. And the next month may be March which contains 31 days which implies that the present month may be February which contains 28 or 29 days.

प्र: If J is the interest on K and K is the interest on L, the rate and time is the same on both the cases. What is the relation between J, K and L ? 1722 0

उत्तर : 2. "K x K= JL"
व्याख्या :
Answer: B) K x K= JL Explanation: Let the Time be 'N' and Rate be 'R' J = (K x NR)/100 K = (L x NR)/100 J/K = NR/100 K/L = NR/100 J/K = K/L K x K = JL

प्र: In a mens hostel, there were 95 students. To accommodate 30 more students the average is decreased by rupees 5. But total expenditure increased by Rs.500. Find the total expenditure of the hostel now ? 4292 0

उत्तर : 1. "Rs. 4680"
व्याख्या :
Answer: A) Rs. 4680 Explanation: Let the expenditure on the 95 students be 'x' Then, 95x + 500 = 120(x – 5)95x + 500 = 120x - 600120x - 95x = 110025x = 1100=> x = 44 Therefore, total expenditure of the hostel becomes95 x 44 + 500 = 4680.

प्र: Amar can do a piece of work in 10 days. He works at it for 4 days and then Arun finishes it in 9 days. In how many days can Amar and Arun together finish the work ? 5861 05b5cc6d6e4d2b4197774e66a

उत्तर : 4. "6 days" व्याख्या :Answer: D) 6 days Explanation: 4/10 + 9/x = 1 => x = 15 Then both can do in 1/10 + 1/15 = 1/6 => 6 days

प्र: A train 125 m long passes a man, running at 4 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is: 1656 05b5cc6d6e4d2b4197774e65b

उत्तर : 1. "49 kmph" व्याख्या :Answer: A) 49 kmph Explanation: Speed of the train relative to man = (125/10) m/sec = (25/2) m/sec. [(25/2) x (18/5)] km/hr = 45 km/hr. Let the speed of the train be 'x' km/hr. Then, relative speed = (x - 4) km/hr. x - 4 = 45 => x = 49 km/hr.

प्र: The cost price of an article is 54% of the marked price. Calculate the gain percent after allowing a discount of 15% ? 1630 05b5cc6d6e4d2b4197774e660

उत्तर : 3. "48.4 %" व्याख्या :Answer: C) 48.4 % Explanation: Let marked price = Rs. 100. Then, C.P. = RS. 54, S.P. = Rs. 85Gain % = 31/64 x 100 = 48.4%.

प्र: A 260 m long train running at the speed of 120 km/hr crosses another train running in opposite direction at the speed of 80 km/hr in 9 sec. What is the length of the other train ? 1484 05b5cc6d6e4d2b4197774e651

उत्तर : 1. "240 mts" व्याख्या :Answer: A) 240 mts Explanation: Relative speed = 120 + 80 = 200 km/hr.= 200 x 5/18 = 500/9 m/sec. Let the length of the other train be L mts.Then, (L + 260)/9 = 500/9 => L = 240 mts.

प्र: At what rate percent on simple interest will Rs.415 amount to Rs.514 in 4 years ? 1415 05b5cc6d6e4d2b4197774e656

उत्तर : 2. "5.96 %" व्याख्या :Answer: B) 5.96 % Explanation: Difference in amount = 514 - 415 = 99 99 = (415 x 4 x R)/100 R = 5.96%

प्र: Calender Puzzle 1608 05b5cc6d5e4d2b4197774e629

प्र: If J is the interest on K and K is the interest on L, the rate and time is the same on both the cases. What is the relation between J, K and L ? 1722 05b5cc6d5e4d2b4197774e5d4

उत्तर : 2. "K x K= JL" व्याख्या :Answer: B) K x K= JL Explanation: Let the Time be 'N' and Rate be 'R' J = (K x NR)/100 K = (L x NR)/100 J/K = NR/100 K/L = NR/100 J/K = K/L K x K = JL

प्र: In a mens hostel, there were 95 students. To accommodate 30 more students the average is decreased by rupees 5. But total expenditure increased by Rs.500. Find the total expenditure of the hostel now ? 4292 05b5cc6d4e4d2b4197774e5cf

उत्तर : 1. "Rs. 4680" व्याख्या :Answer: A) Rs. 4680 Explanation: Let the expenditure on the 95 students be 'x' Then, 95x + 500 = 120(x – 5)95x + 500 = 120x - 600120x - 95x = 110025x = 1100=> x = 44 Therefore, total expenditure of the hostel becomes95 x 44 + 500 = 4680.

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प्र: Amar can do a piece of work in 10 days. He works at it for 4 days and then Arun finishes it in 9 days. In how many days can Amar and Arun together finish the work ? 5861 0

उत्तर : 4. "6 days"
व्याख्या :
Answer: D) 6 days Explanation: 4/10 + 9/x = 1 => x = 15 Then both can do in 1/10 + 1/15 = 1/6 => 6 days

प्र: A train 125 m long passes a man, running at 4 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is: 1656 0

प्र: The cost price of an article is 54% of the marked price. Calculate the gain percent after allowing a discount of 15% ? 1630 0

उत्तर : 3. "48.4 %"
व्याख्या :
Answer: C) 48.4 % Explanation: Let marked price = Rs. 100. Then, C.P. = RS. 54, S.P. = Rs. 85Gain % = 31/64 x 100 = 48.4%.

प्र: A 260 m long train running at the speed of 120 km/hr crosses another train running in opposite direction at the speed of 80 km/hr in 9 sec. What is the length of the other train ? 1484 0

उत्तर : 1. "240 mts"
व्याख्या :
Answer: A) 240 mts Explanation: Relative speed = 120 + 80 = 200 km/hr.= 200 x 5/18 = 500/9 m/sec. Let the length of the other train be L mts.Then, (L + 260)/9 = 500/9 => L = 240 mts.

प्र: At what rate percent on simple interest will Rs.415 amount to Rs.514 in 4 years ? 1415 0

उत्तर : 2. "5.96 %"
व्याख्या :
Answer: B) 5.96 % Explanation: Difference in amount = 514 - 415 = 99 99 = (415 x 4 x R)/100 R = 5.96%

प्र: Calender Puzzle 1608 0

प्र: If J is the interest on K and K is the interest on L, the rate and time is the same on both the cases. What is the relation between J, K and L ? 1722 0

उत्तर : 2. "K x K= JL"
व्याख्या :
Answer: B) K x K= JL Explanation: Let the Time be 'N' and Rate be 'R' J = (K x NR)/100 K = (L x NR)/100 J/K = NR/100 K/L = NR/100 J/K = K/L K x K = JL

प्र: In a mens hostel, there were 95 students. To accommodate 30 more students the average is decreased by rupees 5. But total expenditure increased by Rs.500. Find the total expenditure of the hostel now ? 4292 0

उत्तर : 1. "Rs. 4680"
व्याख्या :
Answer: A) Rs. 4680 Explanation: Let the expenditure on the 95 students be 'x' Then, 95x + 500 = 120(x – 5)95x + 500 = 120x - 600120x - 95x = 110025x = 1100=> x = 44 Therefore, total expenditure of the hostel becomes95 x 44 + 500 = 4680.