jmc

Question

Antonette gets 70% on a 10-problem test, 80% on a 20-problem test and 90% on a 30-problem test. If the three tests are combined into one 60-problem test, which percent is her overall score, rounded to the nearest percent?

Accepted Answer

Note that 70% of 10 is 7, 80% of 20 is 16 and 90% of 30 is 27. Antonette answers 7+16+27=50 problems correctly out of 60 problems in all. Her overall score is 5060 or 83.3%. Rounded to the nearest percent, the answer is 83%.