SOLUTION: Of the 157 students who took a mathematics​ exam, 87 correctly answered the first​ question, 86 correctly answered the second​ question, and 49 correctly answered

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Question 1131025: Of the 157 students who took a mathematics​ exam, 87 correctly answered the first​ question, 86 correctly answered the second​ question, and 49 correctly answered both questions. How many students answered the second question​ correctly, but not the first​?
Answer by ikleyn(52797)   (Show Source): You can put this solution on YOUR website!
.

They want you to take the subset of students who answered correctly the second question (86 students) and subtract 
from this subset the (other) subset of those who correctly answered both questions.


After getting this instruction from me, the solution is in one line:


    "How many students answered the second question correctly, but not the first" = 86 - 49 = 37.    ANSWER

Solved.


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