Four years ago the average of son's and father's age was 27.5. Today, the ratio of their age is 5:16. Find out the son's present age. - IQ786

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Four years ago the average of son's and father's age was 27.5. Today, the ratio of their age is 5:16. Find out the son's present age.

Four years ago the average of son's and father's age was 27.5. Today, the ratio of their age is 5:16. Find out the son's present age.

16

15

14

48

Explanation

Four years ago, the total age: $27.5 \times 2 = 55$ .

Present total age: $55 + 8 = 63$ .

Ratio $5:16$ : Son's age = $5 \times 63 = 15$ .