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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 -

    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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