SOLUTION: father age is twice his son 16 years from now. if his son is 7 years old now, how old is his father now?

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Question 762065: father age is twice his son 16 years from now. if his son is 7 years old now, how old is his father now?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +f+ = Father's age now
Let +s+ = Son's age now
+f+%2B+16+ = father's age in 16 years
+s+%2B+16+ = Son's age in 16 years
-------------------------------
given:
(1) +f+%2B+16+=+2%2A%28+s+%2B+16+%29+
(2) +s+=+7+
------------
(1) +f+%2B+16+=+2s+%2B+32+
(1) +f+-+2s+=+16+
Substitute (2) into (1)
(1) +f+-+2%2A7+=+16+
(1) +f+-+14+=+16+
(1) +f+=+30+
The Father is 30 now
check:
(1) +30+%2B+16+=+2%2A%28+s+%2B+16+%29+
(1) +46+=+2s+%2B+32+
(1) +2s+=+14+
(1) +s+=+7+
OK