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 10080=20% incorrect.
By direct proportions,
20% : 6 problems
100% : X problems?
Cross multiply to get
X=6*100/20=30
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