# SOLUTION: how many quarts of pure anitfreeze must be added to 2 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?

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 Question 263101: how many quarts of pure anitfreeze must be added to 2 quarts of a 10% antifreeze solution to obtain a 30% antifreeze solution?Answer by richwmiller(10283)   (Show Source): You can put this solution on YOUR website!2*.10+x=(2+x)*.3 2*.10+x=2*.3+x*.3 .2+x=.6+.3x .7x=.4 x=4/7quart or 0.571429 quart check 2*.1+4/7=2 4/7*.3 2/10+4/7=18/7*3/10 14/70+40/70=3*18/70 54/70=54/70 ok use fraction instead of decimals 2/10+x=3(2+x)/10 2/10+10x/10=6+3x/10 2+10x=6+3x 7x=4 x=4/7