SOLUTION: How do i set an equation up for this? How many ounces of pure salt must be added to 150 oz of a 50% salt solution to make a 75% salt solution?

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Question 930252: How do i set an equation up for this?
How many ounces of pure salt must be added to 150 oz of a 50% salt solution to make a 75% salt solution?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
50*150 + 100x = 75(x + 150)
7500 + 100x = 75x + 11250
100x - 75x = 11250 - 7500
25x = 3750
x = 3750/25
x = 150 ounces
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