It is a mulit- step equation
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Let Brantley’s age be B then Amanda is B+3 years old and Carlos is 2(B+3) years old.

The sum is B+3+B+2(B+3)=57.

So 4B+9=57, 4B=48, and B=12, so Amanda is B+3=15 years old.

by Top Rated User (679k points)

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