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• 1.
The average weight of boys in a class is 35 kg and the average weight of girls in the same class is 15 kg. If the average weight of the whole class is 27 kg, what could be the possible strength of boys and girls respectively in the same class?
 A. 24 and 16 B. 14 and 26 C. 17 and 23 D. 19 and 21 E. None of these
Ans
A
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• 2.
Three years ago, the average age of a family of 4 members was 14 years. A girl having been born, the average of the family is the same today. What is the age of the girl ?
 A. 1 year B. 2 years C. 6 months D. 9 months E. 2 years and 5 months
Ans
B
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• 3.
The average of marks of 14 students was calculated as 71. But it was later found that the marks of one students had been wrongly entered as 42 instead of 56 and of another as 74 instead of 32. The correct average is :
 A. 67 B. 68 C. 69 D. 71
Ans
C
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• 4.
The average of marks of 28 students in Mathematics was 50. 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school ?
 A. 50.5 B. 37.5 C. 42.5 D. 45
Ans
B
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• 5.
The average of marks obtained by 120 candidates in a certain examination is 35. If the average marks obtained by passed candidates are 39 and those of the failed candidates are 15, what is the number of candidates who passed the examination ?
 A. 100 B. 120 C. 150 D. 140
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A
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