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Solve and substitute.
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Solve and substitute.

Solve and substitute.-example-1
User Sanjeev Siva
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Let's say that the number of boys is x, so then the amount of girls must be 2n. If there are 312 students altogether, then x+2x=312.
Now, we simplify:
x+2x=312
3x=312
x=104
So there are x=104 boys and 2x=208 girls in the 8th grade
User Avtomaton
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