exam Maths Puzzle Numerical Ability

Could someone please help me try and figure this problem out. I have such a hard time with this. How many ounces of pure water must be added to 80oz of a 35% salt solution to make a 14% salt solution. I am not sure on even how to set this up. Thanks

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exam Other Question

Perform the operations and simplify.

2x^2y^2 * cd^2
____ _____
cd 4c^2x
Factor Completely:

ax-bx+5a-5b

6x(2)-26x-20 This shoul read 6x squared

25x2-40+16 This should read 25x squared

x4-3x2-4 This should read x t the 4th adnd 3x squared