What is the smallest positive integer x, such that 7000x is a perfect cube?  Options:
A) 4  B) 6  C) 8  D) 12  E) 18
Take out the factors of 7000x that will come 10^3*7. for perfect cube you need every no. raise to the power 3. for 7000x to be a perfect cube, need two 7 that means 49.   E is the answer.
<result>D</result>
What is the smallest positive integer x, such that 7000x is a perfect cube?