SOLUTION: The father's age 20 years ago is equal to his son's age 10 from now. If the sum of their ages is 50, how old is each now?

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Question 1019531: The father's age 20 years ago is equal to his son's age 10 from now. If the sum of their ages is 50, how old is each now?
Found 2 solutions by josgarithmetic, FrankM:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
f, father now
s, son now

system%28f-20=s%2B10%2Cf%2Bs=50%29

f=s%2B10%2B20
f=s%2B30
-
substitute:
%28s%2B30%29%2Bs=50
2s%2B30=50
s%2B15=25
highlight%28s=10%29

Answer by FrankM(1040) About Me  (Show Source):
You can put this solution on YOUR website!
F-20=S+10
F+S=50
Rearrange first equation
F=S+30
Now substitute -
(S+30)+S=50
S=10
F=40