document.write( "Question 571456: Each student at Sussex Elementary School takes one foreign language. Two thirds of the students take Spanish, 1/9 take French, 1/18 take German, and the rest take some other foreign language. if there are 720 students in the school, how many do not take Spanish, French, and German? \n" ); document.write( "
Algebra.Com's Answer #368076 by josmiceli(19441)\"\" \"About 
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Each student takes 1 language, so this
\n" ); document.write( "problem is like a pie chart. All the slices add
\n" ); document.write( "up to 1.
\n" ); document.write( "Let the fraction of students who do not take
\n" ); document.write( "Spanish, French, and German = \"x\"
\n" ); document.write( "\"+2%2F3+%2B+1%2F9+%2B+1%2F18+%2B+x+=+1+\"
\n" ); document.write( "Multiply both sides by \"18\"
\n" ); document.write( "\"+12+%2B+2+%2B+1+%2B+18x+=+18+\"
\n" ); document.write( "\"+18x+=+18+-+15+\"
\n" ); document.write( "\"+18x+=+3+\"
\n" ); document.write( "\"+x+=+1%2F6+\"
\n" ); document.write( "\"+%281%2F6%29%2A720+=+120+\"
\n" ); document.write( "120 students do not take Spanish, French, and German
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