document.write( "Question 808184: A doctor wants to use three lots of ichthammol containing 50%, 20% and 5% ichthammol respectively. In what proportion should they be mixed to prepare a 10% ichthammol ointment?\r
\n" ); document.write( "\n" ); document.write( "Who helps me
\n" ); document.write( "

Algebra.Com's Answer #486821 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
.5a+.2b+.05c=.1(a+b+c)
\n" ); document.write( "c = 8a+2b
\n" ); document.write( "
\n" ); document.write( "
\n" );