Suppose Joe's utility for lobster (L) and soda (S) can be represented as U= L 0.5 S0.5. Draw the indifference curve that yields a utility level of 9. Calculate the MUL, MUS, and MRS of L for S on that indifference curve when S=3.

I know how to implement formulas for MUL, MUS AND MRS, but i dont know how they got the L to be 27. Which formula do I use?

I know how to implement formulas for MUL, MUS AND MRS, but i dont know how they got the L to be 27. Which formula do I use?