Algebra

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Ellen is 11 years older than Maja. Last year Ellen was twice as old as Maja. How old is Maja now?

  • Algebra -

    E = M+11
    Last year,
    (E-1) = 2(M-1)

    so, substitute:

    (M+11-1) = 2(M-1)
    M+10 = 2M-2
    M = 12
    so, E=23

    Check: last year, 22 = 2*11

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