SOLUTION: How much salt needs to be added to 150 lbs of a 4% solution to make a 7% solution?

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Question 941500: How much salt needs to be added to 150 lbs of a 4% solution to make a 7% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming percents by mass,
x, how much salt to add,

%28%28150%29%2A%280.04%29%2Bx%29%2F%28150%2Bx%29=0.07