SOLUTION: Please help me solve this question. A student answers 80% of the questions on a math exam correctly. If she answers 20 questions correctly,how many questions are on the exam?
Pl
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Question 796416: Please help me solve this question. A student answers 80% of the questions on a math exam correctly. If she answers 20 questions correctly,how many questions are on the exam?
Please help!
Thanks,
Adalia
Answer by wilft1(217) (Show Source): You can put this solution on YOUR website!
another way of asking this question would be... "20 is 80 percent of what number" ?
80/100 = 20/x
reduce to lowest terms...
4/5 = 20/x
this makes it a little easier to figure out...
divide 20 by 4, then multiply by 5 to get 25
so there were 25 questions on the test
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