1.Out of 40 boys in a class, average weight of 30 is 60 kg and the average weight of the remaining is 56 kg. The average weight (in kilogram) of the whole class is:
 A. 58.5
 B. 58
 C. 57
 D. 59
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2.A school has 4 section of Chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student:
 A. 50.25
 B. 52.25
 C. 51.25
 D. 53.25
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3.The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
 A. 0
 B. 1
 C. 10
 D. 19
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4.The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. What is the average of the remaining two numbers?
 A. 4.5
 B. 4.6
 C. 4.7
 D. 4.8
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5.Nine persons went to a hotel for taking their meals. Eight of them spent Rs. 12 each on their meals and the ninth spend Rs. 8 more than the average expenditure of all the nine. What was the total money spent by them?
 A. Rs. 115
 B. Rs. 117
 C. Rs. 119
 D. Rs. 122
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6.The average age of A and B is 20 years. If C were to replace A, the average would be 19 and if C were to replace B, the averge would be 21. What are the age of A, B and C?
 A. 22, 18, 20
 B. 20, 20, 18
 C. 18, 22, 20
 D. None of these
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7.3 years ago the average age of a family of 5 members was 17 years. With the birth of a new baby, the average age of six members remains the same even today. Find the age of the new baby:
 A. 1 year
 B. 2 years
 C. 1\frac{1}{2}
 D. cannot be determined
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8.The average age of a group of person going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average becomes 15.5 years. Find the number of persons initially going for picnic:
 A. 20
 B. 18
 C. 22
 D. None of these
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