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    I know the answer through trial and error but how do you set it out in a

    ???? A father is 36 yrs old and his son is a quarter of his; so, the son's age is 1/4 of 36 = 9. let y = number of years 36 + y = 2 • ( 9 + y ) + 7 36 + y = 18 + 2y + 7 36 + y = 25 + 2y ............................subtract y & 25 from both sides of the equation; 36 + y - y - 25 = 25 + 2y - y...
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