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2015-05-20T19:59:07+08:00

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We just multiply the two values so:
20* \frac{85}{100} = 20*\frac{13}{20} =13

Therefore Joan answered 13 of the questions correctly
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2015-05-21T14:52:06+08:00

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To find how many problems she answered correctly, just multiply 20 by 85%

20 x 85%(or simply 0.85)=17 problems

Therefore she answered 17 problems correctly and 3 of them are incorrect. Hope this helps =)
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