Carly sold 18 rolls of wrapping paper. That is 2 times as many rallsas Jasmine sold. How many rolls of wrapping paper did they sell altogether?

27.

If carly sold 18 and that is 2 x as many as jasmine sold, we can now figure out that jasmine sold 9 (2 x 9 = 18).

The question asks how many they sold together though so we can just add them up

Carly sold 18
Jasmine sold 9
9 + 18 = 27