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Last night, Troy had homework in math and science. He spent 112 minutes altogether on his homework. He spent 3 times as long on science homework as on math homework.
How many minutes did Troy spend on his math homework?

Sagot :

stmkotov1
x=28
112=x+(x*3)
112=x+3x
112=4x
4x=112
x=28
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