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The average of 13 numbers is 10.The average of first 6 numbers is 8 and that of the last 6 numbers is 10. What will be the 13th number?
The average age of a group of eight children is 9 years. Two children, whose ages were 7 years more and 5 years more than the average age, left. Two new...
The average of five positive numbers is 56. If the first number is three-fourth of the sum of the last four numbers, then the average of the last four n...
The average age of a group of four children is 11 years. From the group, one child, whose age was 6 years more than the average age, left. Four new chil...
Find the average of all the numbers between 9 and 31, which are divisible by 5?
The total number of students in class A and B is 72. The number of students in A is 40% more than that in B. The average marks of students in B are 50% ...
The average age of 22 girls is 40 years. If the age of two more girls is added the average decreases by 2.5 years. What is the sum of the age of new girls?
The average age of a group of nine children is 7 years. From the group, three children, whose ages were 3 years more, 2 years more, and 4 years more tha...
The average of five even numbers is 66. If we replace two of these even numbers, 84 and 92, with a single even number X, the new average decreases by 4....
