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30 July, 15:49

Devaughn is 13 years younger than Sydney. The sum of their ages is77 What is Sydney's age?

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  1. 30 July, 16:04
    0
    S is sydney's age. devaughn's age is d. d=s-13. The total sum is 77=s+d OR 77=s+s-13. 77=2s-13. add 13 to both sides. 90=2s. sydney's age is 45. to check, substitute sydney's age in. d=45-13=32. 77=45+32=77.
  2. 30 July, 16:10
    0
    77=x+x-13

    77=2x-13

    -2x=-13-77

    -2x=-90

    x=45

    Sydney's age is 45
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