book Maths Puzzle Numerical Ability

How do I graph the solution set of x > -4

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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 how many pints of a 40% salt solution must be added to 12 pints of 20% salt solution to end up with a 32% salt solution