Because the decimal is over 40 the answer is 15
Here is the graphical representation of the function you provide.
You can see the the points in which the line intersects each axis.
Every point in the line is a possible option for which hot dog package was bought.
For example, Taro might have bought 0 of the packages of 8, and 16 packages of 12.
or He might've bought zero packages of 12, and 24 packages of 8.
Answer:
1 box has 12 chocolates
thus 20 boxes have ( 20 * 12) = 240 chocolates
1 carton has 240 chocolates (20box)
10 cartons have 240 * 10 = 2400 chocolates