Posted by **mm** on Friday, April 15, 2011 at 8:35am.

Mary, who is sixteen years old, is four times as old as her brother. How old will Mary be when she is twice as old as her brother?

- math -
**bobpursley**, Friday, April 15, 2011 at 8:44am
M=16

M=4B

(M+t)=2(B+t)

so B= 4, then

M+t=8+2t

8=t

so mary will be 16+8=24, brother 12, now Mary is 16, brother is 4

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