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judy got 117 problems right on a math test in her night school class. She got a score of 78% right. How many problems were on the test?

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Respuesta :

You would set this up as Part÷Whole=Percent÷100
Part=117
Whole= X
Percent=78
117÷X=78÷100
Set these up as fractions and cross multiply. You will get 117×100=78X
117×100=11,700
Divide both sides by 78 and you get x=150
There were 150 problems

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