Hello! I can help you with this! as we know, Gina walked 2 1/4 miles each day for 20 days. When those numbers are multiplied, the product is 45. Gina walked 45 miles in 20 days. We divide them into half-miles. 2 half-miles equal 1 mile. So if we do 2 * 45, we get 90. Gina's distance of 45 miles is equivalent to 90 half-miles.