document.write( "Question 30777: alter working 4 hours, frank has made 21 machine parts. at the same rate, how many parts can he make in 7 hours? \n" ); document.write( "
Algebra.Com's Answer #17536 by troyapplehelen(46)\"\" \"About 
You can put this solution on YOUR website!
1. 21machines/4 hrs---21:4
\n" ); document.write( "2. x machines/7 hrs---x:7
\n" ); document.write( "3. the same rate---21:4=x:7, 4x=147, x=36.7 so, about 37 machines.
\n" ); document.write( "
\n" );