Examsbook | Hand picked material and question banks

प्र: If you write down all the numbers from 1 to 100, then how many times do you write 4 ? 1820 0

उत्तर : 2. "20"
व्याख्या :
Answer: B) 20 Explanation: 4, 14, 24, 34, 44, 54, 64, 74, 84, 94 => has 11 number of (4's)40, 41, 42, 43, 45, 46, 47, 48, 49 => has 9 number of (4's)So, totally (11 + 9 = 20) number of 4's in 1 to 100.

प्र: In a 100 litre of mixture the ratio of milk and water is 6:4. How much milk must be added to the mixture in order to make the ratio 3 : 1? 1819 0

उत्तर : 2. "60"
व्याख्या :
Answer: B) 60 Explanation: Let M litres milk be added => 60 + M40 = 31 => 60 + M = 120 => M = 60 lit.

प्र: Find the odd one out of the group ? 1818 0

उत्तर : 2. "392"
व्याख्या :
Answer: B) 392 Explanation: The sum of the digits in 708, 618 and 816 is 15, but not in 392.

प्र: 12 students of class IX took part in GK quiz. If the number of boys is 4 more than the number of girls. Find the number of boys and girls took part in the quiz ? 1818 0

उत्तर : 3. "8, 4"
व्याख्या :
Answer: C) 8, 4 Explanation: Let the number of girls = x => x + x + 4 = 12 => 2x = 8 => x = 4 => Number of girls = 4 => Number of boys = 4 + 4 = 8

प्र: A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ? 1818 0

उत्तर : 4. "12 6/7 days"
व्याख्या :
Answer: D) 12 6/7 days Explanation: Let 'B' alone can do the work in 'x' days 6/30 + 18/x = 1 => x = 22.5 1/30 + 1/22.5 = 7/90 => 90/7 = 12 6/7 days

प्र: Four person A, B, C and D. The sum of their present age is 176. Four years ago ratio of their age was 11: 9 : 6 : 14, then find who is eldest and youngest among them ? 1817 0

उत्तर : 2. "D is eldest & C is youngest"
व्याख्या :
Answer: B) D is eldest & C is youngest Explanation: Given sum of present ages of A, B, C & D A + B + C + D = 176 and also given that, (A-4) : (B-4) : (C-4) : (D-4) = 11 : 9 : 6 : 14 Let the ratio = x => A-4 + B-4 + C-4 + D-4 = 11x + 9x + 6x + 14x => (A + B + C + D ) - 16 = 40x => 176 - 16 = 40x => x = 4 => A = 44 + 4 = 48 => B = 40 => C = 28 => D = 60 Therefore, from the above conclusions D is eldest with 60 years and C is youngest with 28 years of ages.

प्र: Square units 13 by 9 of an office area is 1816 0

उत्तर : 2. "117"
व्याख्या :
Answer: B) 117 Explanation: Square units 13 by 9 of an office means office of length 13 units and breadth 9 units. Now its area is 13x 9 = 117 square units or units square.

प्र: If 6 men and 3 boys working together, can do four times as much work per hour as a man and a boy together. Find the ratio of the work done by a man and that of a boy for a given time ? 1815 0

प्र: If you write down all the numbers from 1 to 100, then how many times do you write 4 ? 1820 05b5cc723e4d2b4197774f68b

उत्तर : 2. "20" व्याख्या :Answer: B) 20 Explanation: 4, 14, 24, 34, 44, 54, 64, 74, 84, 94 => has 11 number of (4's)40, 41, 42, 43, 45, 46, 47, 48, 49 => has 9 number of (4's)So, totally (11 + 9 = 20) number of 4's in 1 to 100.

प्र: In a 100 litre of mixture the ratio of milk and water is 6:4. How much milk must be added to the mixture in order to make the ratio 3 : 1? 1819 05b5cc6b4e4d2b4197774d4e3

उत्तर : 2. "60" व्याख्या :Answer: B) 60 Explanation: Let M litres milk be added => 60 + M40 = 31 => 60 + M = 120 => M = 60 lit.

प्र: Find the odd one out of the group ? 1818 05b5cc6e1e4d2b4197774ebca

उत्तर : 2. "392" व्याख्या :Answer: B) 392 Explanation: The sum of the digits in 708, 618 and 816 is 15, but not in 392.

प्र: 12 students of class IX took part in GK quiz. If the number of boys is 4 more than the number of girls. Find the number of boys and girls took part in the quiz ? 1818 05b5cc6bfe4d2b4197774da79

उत्तर : 3. "8, 4" व्याख्या :Answer: C) 8, 4 Explanation: Let the number of girls = x => x + x + 4 = 12 => 2x = 8 => x = 4 => Number of girls = 4 => Number of boys = 4 + 4 = 8

प्र: A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ? 1818 05b5cc6d8e4d2b4197774e755

उत्तर : 4. "12 6/7 days" व्याख्या :Answer: D) 12 6/7 days Explanation: Let 'B' alone can do the work in 'x' days 6/30 + 18/x = 1 => x = 22.5 1/30 + 1/22.5 = 7/90 => 90/7 = 12 6/7 days

प्र: Four person A, B, C and D. The sum of their present age is 176. Four years ago ratio of their age was 11: 9 : 6 : 14, then find who is eldest and youngest among them ? 1817 05b5cc6c1e4d2b4197774db82

प्र: Square units 13 by 9 of an office area is 1816 05b5cc662e4d2b4197774be89

उत्तर : 2. "117" व्याख्या :Answer: B) 117 Explanation: Square units 13 by 9 of an office means office of length 13 units and breadth 9 units. Now its area is 13x 9 = 117 square units or units square.

प्र: If 6 men and 3 boys working together, can do four times as much work per hour as a man and a boy together. Find the ratio of the work done by a man and that of a boy for a given time ? 1815 05b5cc6dae4d2b4197774e8d2

उत्तर : 1. "1 : 2" व्याख्या :Answer: A) 1 : 2 Explanation: 6M + 3B = 4(1M + 1B)6M + 3B = 4M + 4B2M = 1B M/B = 1/2

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: If you write down all the numbers from 1 to 100, then how many times do you write 4 ? 1820 0

उत्तर : 2. "20"
व्याख्या :
Answer: B) 20 Explanation: 4, 14, 24, 34, 44, 54, 64, 74, 84, 94 => has 11 number of (4's)40, 41, 42, 43, 45, 46, 47, 48, 49 => has 9 number of (4's)So, totally (11 + 9 = 20) number of 4's in 1 to 100.

प्र: In a 100 litre of mixture the ratio of milk and water is 6:4. How much milk must be added to the mixture in order to make the ratio 3 : 1? 1819 0

उत्तर : 2. "60"
व्याख्या :
Answer: B) 60 Explanation: Let M litres milk be added => 60 + M40 = 31 => 60 + M = 120 => M = 60 lit.

प्र: Find the odd one out of the group ? 1818 0

उत्तर : 2. "392"
व्याख्या :
Answer: B) 392 Explanation: The sum of the digits in 708, 618 and 816 is 15, but not in 392.

प्र: 12 students of class IX took part in GK quiz. If the number of boys is 4 more than the number of girls. Find the number of boys and girls took part in the quiz ? 1818 0

उत्तर : 3. "8, 4"
व्याख्या :
Answer: C) 8, 4 Explanation: Let the number of girls = x => x + x + 4 = 12 => 2x = 8 => x = 4 => Number of girls = 4 => Number of boys = 4 + 4 = 8

प्र: A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ? 1818 0

उत्तर : 4. "12 6/7 days"
व्याख्या :
Answer: D) 12 6/7 days Explanation: Let 'B' alone can do the work in 'x' days 6/30 + 18/x = 1 => x = 22.5 1/30 + 1/22.5 = 7/90 => 90/7 = 12 6/7 days

प्र: Four person A, B, C and D. The sum of their present age is 176. Four years ago ratio of their age was 11: 9 : 6 : 14, then find who is eldest and youngest among them ? 1817 0

प्र: Square units 13 by 9 of an office area is 1816 0

उत्तर : 2. "117"
व्याख्या :
Answer: B) 117 Explanation: Square units 13 by 9 of an office means office of length 13 units and breadth 9 units. Now its area is 13x 9 = 117 square units or units square.

प्र: If 6 men and 3 boys working together, can do four times as much work per hour as a man and a boy together. Find the ratio of the work done by a man and that of a boy for a given time ? 1815 0

उत्तर : 1. "1 : 2"
व्याख्या :
Answer: A) 1 : 2 Explanation: 6M + 3B = 4(1M + 1B)6M + 3B = 4M + 4B2M = 1B M/B = 1/2