The ratio of the number of cups of mango juice to the number of cups of lemon-lime soda is 10:1.
The ratio of the number of cups of mango juice to the number of cups of lemon-lime soda can be found by looking at the slope of the line on the graph. The slope of the line is the change in y (cups of mango juice) for every 1 unit change in x (cups of lemon-lime soda).
From the graph, we can see that for every 1 cup of lemon-lime soda, 10 cups of mango juice are used. Therefore, the ratio of the number of cups of mango juice to the number of cups of lemon-lime soda is 10:1.
So, the correct answer is: b) 10:1