book Maths Puzzle Numerical Ability

how do you find the surface area of a rectangular prism thats length is 6ft. and width is 4ft, and height of one side is 5ft.

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book Other Question

Solve the following:

2x + 3y = 6
A ten-gallon aquarium is 3 inches higher than it is wide. Its length is 21 inches., and its volume is 2730 inches cubed. What are the height and width of the aquarium?