document.write( "Question 281308: i dont know how to do: The Rocket Coaster has 15 cars, some that hold 4 people and some that hold 6 people. There is room for 72 people altogether. How many 4-passenger cars are there? How many 6-passenger cars are there? \n" ); document.write( "
Algebra.Com's Answer #204321 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
f+s=15
\n" ); document.write( "4*f+6*s=72\r
\n" ); document.write( "\n" ); document.write( "f=9
\n" ); document.write( "s=6
\n" ); document.write( "check
\n" ); document.write( "4*9+6*6=72
\n" ); document.write( "36+36=72
\n" ); document.write( "ok\r
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