A father's age is thrice the sum of the ages of his two children. After five years, his age will be twice the sum of their ages. How old is the father?
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father age is x
sum of two children ages is 2y
x=3(2y), x=6y -----------1
after 5 years
(x+5)=2(2(y+5)), x+5=4(y+5), x+5=4y+20, x=4y+15 ------------2
sub. y from 1 in 2
x=4(x/6)+15
x=(2x/3)+15
x=45years
sum of two children ages is 2y
x=3(2y), x=6y -----------1
after 5 years
(x+5)=2(2(y+5)), x+5=4(y+5), x+5=4y+20, x=4y+15 ------------2
sub. y from 1 in 2
x=4(x/6)+15
x=(2x/3)+15
x=45years
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