SOLUTION: Marco got 2/5 of the questions wrong on his test. What percent of the questions were answered correctly?

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Question 781023: Marco got 2/5 of the questions wrong on his test. What percent of the questions were answered correctly?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+5%2F5+ or +1+ represents all the questions, so
+5%2F5+-+2%2F5+=+3%2F5+ is the fraction of
the questions answered correctly
Multiply top and bottom by +20+
+%28+20%2A3+%29+%2F+%28+20%2A5+%29+=+60%2F100+
"per cent" means "per one-hundred", so
60% were answered correctly