Frank is 15 years younger then John. In 5 years John will be
twice as old as Frank. How old will Frank be in four years?

Answer Posted / taurean

Let age of Frank be F and that of John be J

F + 15 = J
2(F + 5) = J + 5

Solving both of them, F=10 and J=25

So, after 4 years Frank will be 10 + 4 = 14 years...

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