exam Maths Puzzle Numerical Ability

Evaluate the following. Be sure to use the proper units.
5 lb/ft X 3 ft

I am really confused about this evaluating things

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exam Other Question

i cant figure this one out
how many liters of water must be evaporated from 10L of 40% salt solution to produce a 50% solution


THANKs ALOT
In a ball game where only 7 and 10 points can be scored at any one time, what is the largest final score that cannot be obtained?