exam Maths Puzzle Numerical Ability

Determine the range.
17, 16, 10, 15, 20

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exam Other Question

I dont know how to figure these out very well...

cubed root of -125??

Evalute expression without calculator. A small model plane travels 5 miles with the wind in the same amount of time as it takes to go 2 miles against the wind. The plane can travel 3 miles per hour in still air. Find the speed of the wind.