cougarmom44 cougarmom44
  • 26-11-2014
  • Mathematics
contestada

Sarah's English test had 90 questions and she got 18 questions wrong. What percent of the questions did she get correct?

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Espeon
Espeon Espeon
  • 26-11-2014
90-18=72 questions (answered correct)
72/90=0.8
To get the percent, you have to move the decimal point over two places, so 80%
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SchwarzschildRadius
SchwarzschildRadius SchwarzschildRadius
  • 26-11-2014
So,

Sarah got 72/90 questions correct.

Simplify 72/90
72 = 2 * 2 * 2 * 3 * 3
90 = 2 * 3 * 3 * 5

Cross out "ones"
2 * 2 over
5
4/5 = 80%

Sarah got 80% of the questions correct
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