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Please explain your answer in steps, question is in the picture

Please explain your answer in steps, question is in the picture-example-1
User Stijndcl
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1 Answer

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15 years old

working:-
let sydney’s age be=y
let devaughns age be=3y
•sum of their age is 60
so,
y+3y=60
4y=60
y=60/4
y=15

User Marshall
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