Latest Infosys Aptitude Question SOLUTION: When you reverse the digits of age of father u will get the age of son. One year ago the age of father was twice that of son's age. What are the current ages of father and son?

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When you reverse the digits of age of father u will get the age of son. One year ago the age of father was twice that of son's age. What are the current ages of father and son?

Asked In Infosys Devendra Marghade (11 years ago)

Solved Vignesh Read Solution (1)

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Read Solution (1) :

Vignesh  (11 years ago)

Current Father age = 73; Son's age = 37

Let, f = father's age and s = son's age.

f = 10a + b
s = a + 10b;
f - 1 = 2(s - 1) so
f = 2s - 2 + 1
(ie)f = 2s - 1

Therefore,
10a + b = 2a + 20b - 1
8a = 19b - 1, making a = 7 and b = 3.

So Father is 73 and son is 37. (Last year f = 72, s = 36)

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