SOLUTION: Mary, who is 16 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 610125: Mary, who is 16 years old, is four times as old as her brother. How old will Mary be when she is twice as old as her brother?
Answer by flame8855(424) About Me  (Show Source):
You can put this solution on YOUR website!
b=16/4 = 4
16+x 2(x+4)
16+x=2x+8
x= 8
after 8 years so 24 years