document.write( "Question 810172: A merchant has coffee worth $20 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $20 coffee should be used? \n" ); document.write( "
Algebra.Com's Answer #489408 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
20x+50*90=40*(x+90)
\n" ); document.write( "x=45
\n" ); document.write( "
\n" );