If Frank’s age is double of Willis’ age and the sum of their ages is 42. What are their ages?

Discussion in 'Calculator Requests' started by math_celebrity, Mar 23, 2020.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    If Frank’s age is double of Willis’ age and the sum of their ages is 42. What are their ages?

    Let Frank's age be f. Let Willis's age be w. We're given two equations:
    1. f = 2w <-- Double means multiply by 2
    2. f + w = 42
    Substitute equation (1) into equation (2):
    2w + w = 42

    To solve for w, type this equation into our search engine. We get:
    w = 14

    Now, take w = 14, and substitute it back into equation (1) to solve for f:
    f = 2(14)
    f = 28
     

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