SOLUTION: 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?

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Question 936380: 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?
Found 3 solutions by josgarithmetic, lwsshak3, MathTherapy:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
m Marry, b Brother

m=16;
m%2Fb=4;
m=4b
16=4b
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.
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Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
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?
***
let x=number of years Mary will be twice as old as her brother
%2816%2Bx%29%2F%284%2Bx%29=2
16+x=8+2x
x=8
16+8=24
How old will Mary be when she is twice as old as her brother? 24

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

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?


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