exam Maths Puzzle Numerical Ability

Detergent Problem: Large boxes of detergent, containg 3 pounds 7 ounces, cost $2.04. Small boxes, containing 17 ounces, cost just $.71. Assume that you pay a fixed rate per ounc

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Choose the rectangular coordinates for the following polar coordinate: (-6, 3pi/2)
is it (-6, 0)?? The cylinder diameter is 19 depth 1.6 at the rate of 14m3 per hr.
How many hrs. will it take to empty the pool? Thanks