SOLUTION: At present, Pedro's age is 25% of his father age. Twenty years from now, Pedro's age will be 50% of his father's age. How old are they?

Question 1151780: At present, Pedro's age is 25% of his father age. Twenty years from now, Pedro's age will be 50% of his father's age. How old are they?
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
Let P be Pedro's age and F be his father's age, then
:
P = F/4
:
(P +20) = (F +20)/2
:
substitute for P in the second equation
:
(F/4 +20) = (F +20)/2
:
multiply both sides of = by 4
:
F +80 = 2F +40
:
F = 40
:
P = F/4 = 40/4 = 10
:
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Pedro is 10 years old and Pedro's father is 40 years old
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