SOLUTION: Please help me solve this problem: How much pure antifreeze must must be added to 12L of 40% solution of antifreeze to obtain a 60% solution? Thank you.

Question 25877: Please help me solve this problem: How much pure antifreeze must must be added to 12L of 40% solution of antifreeze to obtain a 60% solution?
Thank you.
Answer by venugopalramana(3286) (Show Source): You can put this solution on YOUR website!
SEE THE FOLLOWING EXAMPLE AND TRY.IF YOU STILL CANT GET COME BACK FOR US TO ANSWER.
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How much water must be evaporated from a 300L tank of a 2% salt solution to obtain a 5% solution?
300 LITRES OF 2% SOLUTION WILL HAVE 300*2/100=6 SALT AND 300-6 = 294 WATER.
LET X LITRES BE EVAPORATED.HENCE WE HAVE 294-X WATER.AND 6 SALT =TOTAL 300 - X LITRES.
HENCE SALT % IN THIS IS
=6*100/(294-X)= 5 % AS GIVEN
600/(294-X)=5
294-X=600/5=120
X=294-120 = 174
HENCE 174 LITRES ARE TO BE EVAPORATED TO GET 5% SOLUTION.

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