Emily earned a grade of 80% on a math test that had 20 problems. How many problems on this test did she answer correctly? If John got 7 problems incorrect on the same test, what was his grade?

Question

Victor

Mathematics

5 April, 08:09

Emily earned a grade of 80% on a math test that had 20 problems. How many problems on this test did she answer correctly? If John got 7 problems incorrect on the same test, what was his grade?

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Answers (2)

Know the Answer?

James Spears · Answer 1

0.8*20 = 16 problems answered correctly

If John got 7 problems wrong, then he got 14 problems right.

14/20 = 0.7

Now, convert 0.7 into a percentage.

Rosemary Oconnell · Answer 2

Someone getting all 20 problems correct would earn a grade of 100%. Thus, each correct question counts 5%.

If Emily earned 80%, then the number of problems she got correct was (80% / 100%).

Simplify this result. It represents the fraction of 20 questions that Emily got correct. Multiply your result by 20 to find the actual number of questions that E. got correct.