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What I did is this:

3(cube root of x)=12

3(cuberoot of x)/3=12/3

squareroot of x=4

That means: Cube of 4 is the answer!

So, answer=64!

Check:

cube root of 64 is 4

(thrice)

3 x 4= 12

Therefore 64 is the answer!

3(cube root of x)=12

3(cuberoot of x)/3=12/3

squareroot of x=4

That means: Cube of 4 is the answer!

So, answer=64!

Check:

cube root of 64 is 4

(thrice)

3 x 4= 12

Therefore 64 is the answer!

Let n be the number . 3(cuberoot of n)=12 cuberootofn=12/3 cuberootofn=4 .the cube bothside n=64