For a rectangle, if x is the length and 2x is the width. Then find out x from the area of the rectangle?
if the area is equal to 200 then the length of the rectangle is 10.
Usually, if the dimensions of a rectangle are x and 2*x, then 2*x would be called its 'length', and x would be called its 'width'.
Replace NaNs with the number that appears to its left in the row.
Rotate input square matrix 90 degrees CCW without rot90
find the surface area of a cube
Basic commands - Least common multiple
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