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A math teacher gave her class two tests. Twenty-five percent of the class passed both tests and 42 percent of the class passed only the first test. What percent of the students who passed the first test also passed the second?

 

A. 25%


B. 60%


C. 67%


D. 40%

 Dec 3, 2019
 #1
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P ( passing first test)  *  P (passing second test)  =  P(passing both tests)

 

.42   *  P(passing second test )  =  .25          divide both sides by .42

 

P(passing second test)  =  .25 /.42  ≈  .595  ≈  60%

 

 

cool cool cool

 Dec 3, 2019

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