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 / nashwa

F=J-15 (1)
5+J=2(F+5)
then from (1) J=F+15
so 5+F+15=2F+10
20+F=2F+10
f=10
after 4 years he will be 14 years

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