SOLUTION: Mary's score was a 90% she had 81 questions right how many questions were on the test

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Question 1073506: Mary's score was a 90% she had 81 questions right how many questions were on the test
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
81=%2890%2F100%29X
X=81%28100%2F90%29
X=8100%2F90
X=90
90 questions.