exam Maths Puzzle Numerical Ability

a manufacturer of automobile water pumps is considering retooling for one of the two manufacturing processes, with monthly fixed costs and unit costs indicated in the illustration

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McGraw Hill 6th edition, 8.3 # 58.
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The length of a rectangle is 2 inches more than twice its width. If the perimeter of the rectangle is 34, find the dimensions of the rectangle. jerry spent 2.5 h biking up mount lowe, rested at the top for 30 min, and biked down in 1.5 hr. how far did he bike if his rate of ascent was 3 km/h less than his rate of descent?