Posted by **Willie** on Thursday, July 19, 2012 at 7:27pm.

Maria answered all the problems on her math test. She answered 80 percent of the problems correctly. If she answered 6 problems incorrectly, how many problems were on the test?

- Mathematics -
**Ms. Sue**, Thursday, July 19, 2012 at 7:33pm
Let x = the total number of problems.

0.2x = 6

x = 6/0.2

x = 30

- Mathematics -
**MathMate**, Thursday, July 19, 2012 at 7:35pm
This is a direct proportion problem.

80% correct means 100-80=20% incorrect.

By direct proportions,

20% : 6 problems

100% : X problems?

Cross multiply to get

X=6*100/20=30

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