SOLUTION: A man is twice as old as his son. Ten years ago, he was thrice as old as the son. what is the man's age today?

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Question 1028386: A man is twice as old as his son. Ten years ago, he was thrice as old as the son. what is the man's age today?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
Set M = man's age
S = son's age
M = 2S
M - 10 = 3(S - 10)
Substitute 2S for M in M - 10 = 3(S - 10)
2S - 10 = 3(S - 10)
2S - 10 = 3S - 30
add -2S to each side
- 10 = S - 30
add 30 to each side
20 = S
Since M = 2S
M = 2(20) = 40