Question

Serenity earned a grade of 39% on her multiple choice science final that had a total of

200 problems. How many problems on the final exam did Serenity answer correctly?

Answer 1

78 problems were answered correctly

Answer 2

78

Explanation:

The number of correct problems is found by multiplying the percentage that were correct by the total number of problems.

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number correct = fraction correct × number of problems

number correct = 0.39 × 200 = 78

Serenity answered 78 problems correctly.

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Additional comment

The symbol % is fully equivalent to /100. That is 39% = 39/100 = 0.39 (pronounced "thirty-nine hundredths"). Using a percent symbol is just another way to write a fraction.