You have a fraction of 13/20. The 13 is the amount of children that prefer fries out of 20 children in total. Multiply the 20 by 5 and you get 100. Then multiply the 13 by 5 since what you do to the bottom you gotta do to the top and you get 65/100. Next there are 13 adults that prefer fries over 25. 25 times 4 is equal to 100 and what you do to the top you gotta do to the bottom. 13 times 4 is 52. 65/100 children prefer fries and 52/100 adults prefer fries. The first box you put 65, the second box you put 52, and the third you put more likely