A father is 5 times older than son. 18 years later, he will only be thrice as old as his son. what is son's present age?
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let the father's age be x and son's age be y
x=5y;x-5y=0
18 years after
x+18=(y+18)3
x+18=3y+54
x-3y=36
x-5y=0
x-3y=36
- + -
-2y=-36
y=-36÷-18
y=2
present age of son is 2
x=5y;x-5y=0
18 years after
x+18=(y+18)3
x+18=3y+54
x-3y=36
x-5y=0
x-3y=36
- + -
-2y=-36
y=-36÷-18
y=2
present age of son is 2
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