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Posted by on Sunday, February 20, 2011 at 6:14pm.

two people aged 15 and 50. At some point during their lives, the elder will be three times the age of the younger. Write an equation which models how old in years each will be when the elder will be three times as old as the younger person.

  • Math - , Sunday, February 20, 2011 at 6:47pm

    50 + x = elder's future age
    15 + x = younger persons future age

    50 + x = 3(15 + x)
    50 + x = 45 + 3x
    2x = 5
    x = 2.5 yrs

    50 + x = 50 + 2.5 = 52.5 yrs
    15 + x = 15 + 2.5 = 17.5 yrs

    3 * 17.5 = 52.5

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