Question

The average age of a group of four children is 11 years.

Q: Answer-The average age of a group of four children is 11 years. From the group, one child, whose age was 6...

Initial sum of the ages of 4 children 11 x 4 44 years Age of the child leaving 11 6 17 years Sum of the ages after one child left 44 17 27 years Sum of the ages of 4 new children 11 5 x 4 64 years Total sum of the ages with new children 27 64 91 years Number of children now 4 - 1 4 7 New average age 917 13 years

From the group, one child, whose age was 6 years more than the average age, left. Four new children, whose average age is 5 years more than the given average age, join the group. Find the new average age.

A 10.5 years

B 9 years

C 8.5 years

D 13 years

E 8 years

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The average age of a group of four children is 11 years.

Solution