document.write( "Question 271565: the ratio of boys to all students in sam middle school is 2:5. there are 123 girls in the school. how many boys in the school? \n" ); document.write( "

Algebra.Com's Answer #198781 by andriana121(7) $\"\"$ $\"About$

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Since the ratio of boys is 2:5, then the ratio of girls is 3:5. \r
\n" ); document.write( "\n" ); document.write( "To find out how many boys are in the class, you first need to figure out how many students there are.\r
\n" ); document.write( "\n" ); document.write( "To figure out how many students there are you need to set up a proportion. You should have this: $\"3%2F5=123%2Fx\"$ \r
\n" ); document.write( "\n" ); document.write( "Mulitply 123 and 5 to get 615, then divide by 3 to get 205.\r
\n" ); document.write( "\n" ); document.write( "x=205\r
\n" ); document.write( "\n" ); document.write( "There are 205 students in all.\r
\n" ); document.write( "\n" ); document.write( "If there are 123 girls in the class, and 205 students in all, subtract girls from the students to find out how many boys are in the class.\r
\n" ); document.write( "\n" ); document.write( "205-123=82.\r
\n" ); document.write( "\n" ); document.write( "Therefore, there are 82 boys in the class. \n" ); document.write( "

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