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

Question

Mathematics

Jamie Arnold

26 March, 12:49

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

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Answers (2)

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Meghan Terry · Answer 1

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.

Corinne Logan · Answer 2

77=x+x-13

77=2x-13

-2x=-13-77

-2x=-90

x=45

Sydney's age is 45