SOLUTION: How many kilograms of water must be added to 10 kg of a 75% antifreeze solution in order to produce a 50% solution?

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Question 164109: How many kilograms of water must be added to 10 kg of a 75% antifreeze solution in order to produce a 50% solution?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
10*.75=(10+x).50
7.5=5+.5x
.5x==7.5-5
.5x=2.5
x=2.5/.5
x=5 kg ofwater needs to be added.
Proof:
10*.75=(10+5).5
7.5=15*.5
7.5=7.5