Question 760789
Let Tim's age be x. 

Then Billy's age is (3*x) - as given in the problem.

Sum of the ages = {{{x + 3*x}}} is 92

{{{x + 3*x = 92}}}

Adding on the left side,

{{{4*x = 92}}}

Dividing both sides by 4 to get x

{{{x = 92/4 = 23}}}

Tim's age is {{{23}}} and Billy's age is {{{69}}}