The orchard needs to fills n order for 156 apples using both large and small bags. what is the least number of each type of bag that could be used if each bag is completely filled?

I find a similar question that looks like this:
The apples can be packed into a large bag that holds 9 apples or a small bag that holds 6 apples. The orchard needs to fill an order for 156 apples using both large and small bags. What is the least number of each type of bag that could be used if each bag is completely filled?

The correct answer for the question that is being presented above is this one: 
Given is 16 large bags and 2 small bags.

16 * 9 =144

2 * 6 = 12

144 + 12 = 156