book Maths Puzzle Numerical Ability

a truck sprang a leak at the bottom of its radiator..which held 480 ounces of fluid when it started to leak..and started losing radiator fluid at the constant rate of 4 ounces per

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A chemist wants to mix a 75% acid solution with a 35% acid solution to produxe 400 ml of a 50% acid solution. How many ml of each solution should he use? Could someone show me how to do this problem? Thank you. How do I graph the solution set of x > -4