If the arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is :
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A librarian purchased 50 storybooks for his library. But he saw that he could get 14 books more by spending Rs. 76 more but per book average becomes Rs. 1 less. The average price (in Rs.) of each book he bought, was :
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The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?
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3
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Find the average of all prime numbers between 30 and 50.
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4
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After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member?
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5
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The average score of a cricketer for ten matches is 38.9 runs. If the average for the first six matches is 42, then find the average for the last four matches.
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6
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The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is-
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7
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The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. What is the weight of A ?
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8
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30 pens and 75 pencils altogether were purchased for Rs. 510. If the average price of a pencil was Rs. 2, what was the average price of a pen ?
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9
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If 25a + 25b = 115, what is the average of a and b?
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10
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Find the average of 1.11, 0.01, 0.101, 0.001, 0.11 = ?
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