document.write( "Question 1011699: 1) How many cubic centimeters of water must be evaporated from 32 cubic centimeters of 4% solution of salt and water to make a solution that is 16% salt?\r
\n" ); document.write( "\n" ); document.write( "2) How much pure silver must be added to 80 grams of fine silver (an alloy of 90% silver) to obtain a sterling silver (an alloy that is 92.5% silver)?\r
\n" ); document.write( "\n" ); document.write( "3) A solution of water and alcohol is 80% alcohol. How much alcohol must be added to 50 gallons of this solution to make it 90% alcohol?\r
\n" ); document.write( "\n" ); document.write( "Thanks in advance!
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #627443 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
(1)
\n" ); document.write( "w, amount of volume to evaporate for removal;
\n" ); document.write( "Amount of salt stays the same but amount of solution becomes less as result of removal of some w water.
\n" ); document.write( "\"32%2A4%2F%2832-w%29=16\"
\n" ); document.write( "-
\n" ); document.write( "\"16%2832-w%29=32%2A4\"
\n" ); document.write( "\"16%2A32-16w=32%2A4\"
\n" ); document.write( "\"-16w=32%2A4-16%2A32\"
\n" ); document.write( "\"16w=16%2A32-32%2A4\"
\n" ); document.write( "\"w=32-2%2A4\"
\n" ); document.write( "\"highlight%28w=24%29\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "(2) and (3), learn this:Two part mixture, one material quantity known, the other unknown
\n" ); document.write( "
\n" );