The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number?

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The average of first 10 natural numbers is____________?

A. 5 B. 5.5 C. 6.5 D. 6...

The average age 9 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new member than the old number?

A. 7 years B. 11 years C. 18 years D. 27 years...

Find the average of the series : 312, 162, 132, 142 and 122?

A. 194 B. 174 C. 162 D. 186...

Five years ago the average of the ages of A and B was 40 years and now the average of the ages of B and C is 48 years. What will be the age of the B ten years hence?

A. 55 years B. 56 years C. 58 years D. Data inadequate...

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ration of the number of boys to the number of girls in the class is___________?

A. 1:2 B. 2:3 C. 3:4 D. 3:5...