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Maths Puzzle
Numerical Ability
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an air pump and a gang valve for an aquarium cost $31. The air pump costs 1 dollar less than 3 times the cost of the gang valve. Find the cost
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book Other Question
From a square piece of cardboard with width x inches, a square of
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the remaining piece as a function of x.
An electric hoist is used to lift a piece of equipment. The diameter of the drum on the hoist is 10 inches, and the equipment must be raised 1 foot. Find the number of degrees through which the drum must rotate.