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    How old is Karley?

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    Karley is twice as old as Lana. Three years from now, the sum of their ages will be 42. How old is Karley?

    © BrainMass Inc. brainmass.com October 9, 2019, 3:46 pm ad1c9bdddf
    https://brainmass.com/math/basic-algebra/how-old-karley-12817

    Solution Preview

    PROBLEM:

    Karley is twice as old as Lana. Three years from now, the sum of their ages will be 42. How old is Karley?

    SOLUTION:

    We can solve this problem using either one or two variables:

    1. One-variable solution:

    We'll let Lana's age be x. We can set up a chart:

    now:
    Karley 2x
    Lana x

    in 3 years:
    Karley 2x + 3
    Lana x + 3

    The sum of their ages in 3 years will be 42, so we have:

    (2x + 3) + (x + 3) = 42
    3x + 6 = 42
    3x = 36
    x = 12
    If Lana is 12, Karley is 24; in three years they will be 15 and 27, and the sum of their ages will be 42.

    2. Two-variable solution:
    If we want to use two variables to express the given information, we will need two equations to solve for these ...

    Solution Summary

    In a step-by-step process, this solution assists in solving algebraic problem using one or two variables: How old is Karley?

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