exam Maths Puzzle Numerical Ability

If 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank of diameter 20 feet?

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exam Other Question

It takes the earth 1.0 years to travel around the sun. It takes Venus 0.615 years to orbit the sun. If the planets are in a straight line with the sun now, how long will it take before this is the case again? Find the Maturity value if Principle = $1400., Rate = 16%, Compounded quarterly over 6 yrs.

Please help,

Ellen