exam Maths Puzzle Numerical Ability

please help me to solve

Pencils cost 25 cents apiece. Pens cost 80 cents apiece. Susan spent $20 for a total of 36 pens and pencils. How many pencils did she buy?

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exam Other Question

find the inverse function g of the given function and state the domain and range of g

y=f(x)=(x+2)^3 A cylinder has a radius of 5 in. If the volme of the cylinder is 250 in.3, what is the height of the cylinder? [Hint: The volume of a cylinder is given by V = r2h.]

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