book Maths Puzzle Numerical Ability

On a string of pearls, the middle pearl is the largest and most expensive of all. Starting from one end, each pearl is worth $100.00 more that the one before it up until the middle

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book Other Question

What happens to the volume if the length is doubled, the height is doubled, and the width is tripled? 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.