book Maths Puzzle Numerical Ability

Hi. Here is a problem I am having trouble with:

Two cubes have sides of lengths 4 cm and 6 cm, respectively. What is the ratio of their volume?

Thanks for your help!

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book Other Question
The question is :
Phyllis invested $12,000, part at 14% annual interest and the remainder at 10%. Last year she earned $1,632 in interest. How much money did she invest at each how do i factor 9x-3y+6?