exam Maths Puzzle Numerical Ability

How much water (ounces)must be evaporated from 16 ounces of a 2% salt solution to make a 4% salt solution?

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y to 0 power x -8power/x to -7 power z((y 5power)-2power/z 0 power)9power - x 11power/y 4power)) Suppose Charlie O�Brian hits a baseball straight upward at 150ft/sec from a height of 5 ft.