Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average expense per boarder is Rs. 700 when there are 25 boarders and Rs. 600 when there are 50 boarders. What is the average expense per boarder when there are 100 boarders?
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If 25a + 25b = 115, what is the average of a and b?
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The average of 11 results is 60. If the average of first six results is 58 and that of last six is 63, find the 6th result-
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The average of first five multiples of 3 is:
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The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 grams. Find the weight of the teacher (in kg.)
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The average of the largest and smallest 3 digits numbers formed by 0, 2 and 4 would be :
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The average age of A, B, C, D and E is 40 years. The average age of A and B is 35 years and the average of C and D is 42 years. Age of E is :
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Five years ago, the average age of A, B, C and D was 45 yr. with E joining them now, the average of all the five is 49 yr. How old is E?
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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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Find the average of all prime numbers between 30 and 50.
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The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then-
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