SOLUTION: Last year, Sam was 10 year-old younger than Richard. This year, the age of Sam is three-fifth of that of Richard. How old is Sam this year?

Question 1105080: Last year, Sam was 10 year-old younger than Richard. This year, the age of Sam is three-fifth of that of Richard. How old is Sam this year?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Sam's age now
Let = Richard's age now
--------------------------------
(1)
(2)
--------------------------------
(1)
(1)
Plug (2) into (1)
(1)
(1)
(1)
(1)
and
(2)
(2)
Sam is 15 this year
--------------------------
check answer:
(1)
(1)
(1)
and
(2)
(2)
(2)
OK
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