SOLUTION: 4 litres of a 4% solution must be mixed with a 10% solution to get a 6% solution . How many litres of the 10% solution are needed?

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Question 847213: 4 litres of a 4% solution must be mixed with a 10% solution to get a 6% solution . How many litres of the 10% solution are needed?
Answer by swincher4391(1107) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the litres needed for 10% solution. We know that we already use 4 litres of 4%. This means that 4+x will be used for our 6% solution.

x(.10) + 4*.04 = 4+x * (.06)
.1x + .16 = .24 + .06x
.04x = .08
x = 2 litres.