Twenty times the square of a non-zero number is equal to 15 times the number. what is the number?

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What is the lcm of 16 and 40 ? 24 and 40 ?

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap