Posted by Anonymous on Monday, November 3, 2008 at 6:57pm.
Mark is 11 years older than his sister. In 8 years he will be twice as old as she will be then. How old are they now?

Math  economyst, Tuesday, November 4, 2008 at 9:08am
M = S+11
M+8 = 2*(S+8) = 2*S + 16
Now solve
M = 2S+8
2S+8 = S+11
S = 3
M = 14

Math  Alexa, Tuesday, June 21, 2016 at 6:46am
T=25+R
R=255=20
20+25=45
T=45
R=20

Math  Anonymous, Tuesday, December 6, 2016 at 6:17pm
Bob is 8 years older than his sister. 3 years ago he was 3 times older than his sister. How old are they both?
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