Question 435545
The question is students in the class take two tests. 20% of the class passed both tests and 57% of the class passed the first test. What percentage of those who passed the first test also passed the second test? 
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Draw a Venn diagram with 2 intersecting circles.
Label one circle "1st test"
Label the other circle "2nd test"
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Put 20% in the intersection.
Put 57%-20% = 37% in the 1st cicle that is not part of
the intersection.
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What percentage of those who passed the first test also passed the second test? 
20/57 = 0.35 = 35%
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Cheers,
Stan H.