SOLUTION: THE SUM OF MR LEE'S AND HIS SON'S AGE IS 49. IN THREE YEARS TIME, HE WILL BE 4 TIMES AS OLD AS HIS SON. FIND THEIR PRESENT AGES

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Question 148547: THE SUM OF MR LEE'S AND HIS SON'S AGE IS 49. IN THREE YEARS TIME, HE WILL BE 4 TIMES AS OLD AS HIS SON. FIND THEIR PRESENT AGES
Answer by Alan3354(69443) About Me  (Show Source):
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THE SUM OF MR LEE'S AND HIS SON'S AGE IS 49. IN THREE YEARS TIME, HE WILL BE 4 TIMES AS OLD AS HIS SON. FIND THEIR PRESENT AGES
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L = Mr. Lee's age
S = Son's age
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S+L = 49
L+3 = 4*(S+3)
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Sub for L, L = 49-S
49-S + 3 = 4*(S+3)
52-S = 4S+12
40 = 5S
S = 8
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L = 49-S
L = 41