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Mary's age is 2/3 that of Peter's. Two years ago Mary's age was 1/2 of what Peter's age will be in 5 years time. How old is Peter now? Explain your workings

  • Mathematics -

    Let Mary=Y Peter=X
    Mary is 2/3 Peter's age therefore:
    Y =2/3X

    two years ago..mary was 1/2 peter's age in 5 years..we write the equation as:

    (Y) -2 = 1/2(x+5)
    substitute Y=2/3X

    2/3X - 2 = 1/2x + 5/2
    solve for X
    X=27.....therefore Y=18

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