exam Maths Puzzle Numerical Ability

The corresponding edges of two similar triangular prisms are in the ratio 3:5. What is the ratio of their surface areas? What is the ratio of their volumes?

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exam Other Question

A plane files 600 miles with a tail wind in 2 hours. It takes the same plane 4 hours to fly the 600 miles when flying against the wind. What is the planes speed in the still air? Which property of the real numbers is illustrated by the following statement?
(6+12)+8=6+(12+8)?