SOLUTION: Sam is twice as old as John was two years ago. If the difference between their ages be 2 years, how old is Sam today?

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Question 346558: Sam is twice as old as John was two years ago. If the difference between their ages be 2 years, how old is Sam today?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Two years ago, John was J-2.
1.S=2%28J-2%29
2.S-J=2
From eq. 2,
S=J%2B2
Substitute into eq. 1,
J%2B2=2J-4
-J=-6
highlight%28J=6%29
Then from eq. 2,
S-6=2
highlight%28S=8%29
.
.
.
Today, John is 6 and Sam is 8.