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Question

Jeremy is 15 years old. His father is 4 times as old as him now.
In how many years’ time will their total age be 115 years?

Answer

Jeremy is 15 years old.

His father is 4*15= 60 years old.

So if n is the number of years when their total age is 115 years,

(Jeremy’s age after n years) + (His father’s age after n years) = 115
(15 + n)                                     + (60 + n)                                         = 115
75 + 2n = 115
2n = 115 -75 = 40
n = 20 #

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