book Maths Puzzle Numerical Ability

A roast was cooked at 325 °F in the oven for 4 hours. The internal temperature rose from 32 °F to 145 °F. What was the average rise in temperature per hour?

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2/5 - y/y-2

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a farmer has 280 meters of fencing and wants to enclose a rectangular area of 4000 square meters.what dimensions should he use?