exam Maths Puzzle Numerical Ability

A circular swimming pool with a diameter of 30 ft and a horizontal bottom contains 22,000 gallons of water. What is the depth of the water in the pool? (one cubic foot contains approximately 7.5 gallons of water.)
Book Answer: 4.15 ft

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exam Other Question
What percent of 40 is 25 Solve for x:

A.) Log(base 3)4 + log(base 3)5 = log(base 3)(4x+5)

B.)log(base 7)6 -log(base 7)(x-1) = log(base 7)3

C.)3log(base x)4 = 2