Father and son

A father's age is five years more than four times his son's age. In 5 years, he will be three times his son's age then. How old is the son now?

Correct answer:

s =  5

Step-by-step explanation:

f=5+4s f+5=3 (s+5)  f=5+4 s f+5=3 (s+5)  f4s=5 f3s=10  Row2Row1Row2 f4s=5 s=5  s=15=5 f=5+4s=5+4 5=25  f=25 s=5

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