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Maths Puzzle
Numerical Ability
the radius r of a sphere is increasing at a rate of 2 inches per minute. find the rate of change of the volume when r=6 inches and dr/dt=24 inches.
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book Other Question
A fruit crate has square ends and is twice as long as it is wide. Find the volume if its width is 20 inches.
solve by the elimination
2r-5s=-18
5r+2s=42