Problema Solution
the present age of A's father is four times A's present age. five years back he was seven times as old as A at that time. what is the present age of A's father.
Answer provided by our tutors
let
a = the present age of A
f = the present age of A's father
the present age of A's father is four times A's present age
f = 4a
five years back he was seven times as old as A at that time
f - 5 = 7(a - 5)
by solving the system of equations
f = 4a
f - 5 = 7(a - 5)
we find
f = 40 years
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the present age of A's father is 40 years.