Question

Mark will be 3 times as old as he was 4 years ago after 18 years.find his present age.​

Answer 1

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Let the age of Mark be x.

(x+18)=3(x-4)

x+18=3x-12

-3x+x=-12-18

-2x= -30

x=15

Thus age of Mark is 15 years.

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Answer 2

let the age of Mark be x

x+18=3(x-4)

x+18=3x-12

18+12=3x-x

30=2x

x = 15

Mark present age is 15 yrs