document.write( "Question 910965: Please help me solve this problem.
\n" ); document.write( "A survey was made of the courses taken by 80 students in a class. The figures obtained are shown below,
\n" ); document.write( "Mathematics only,15
\n" ); document.write( "Physics and Mathematics,40
\n" ); document.write( "Mathematics but not Computer Studies,35
\n" ); document.write( "Mathematics,70
\n" ); document.write( "Computer Studies and Physics,24
\n" ); document.write( "Physics,50
\n" ); document.write( "Determine the number of students who took
\n" ); document.write( "1)Computer studies
\n" ); document.write( "

Algebra.Com's Answer #552814 by richwmiller(17219)\"\" \"About 
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39 students took Computer Science but no one took only computer science
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