Asmoothie shop has 40 stores and 55% of the stores are in california the rest of the stores are in nevada. how many are in nevada?

Given:
40 stores in total
55% of the stores are in California, the rest are in Nevada.

This is simply multiplying the corresponding percentage from the whole to get its number and deducting the number to get the required number.

40 represents 100%.

40 x 55% = 22 stores in California
40 - 22 = 18 stores in Nevada. 

There are 18 stores in Nevada.

Since 55% represents  California, then, 45% represents Nevada.

40 * (100%  - 55%) = 40 * 45% = 18 stores.