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=25-5=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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