Katie won't have more than 100 shells until the 7th day
14 (286/20 = 14,3) you just need to remove the decimal and you can see how many times it can enter
1/2 + 3/4 = 2/4 + 3/4 = 5/4 = 1 1/4
Here I change to the common denominator 4 so I could add them.
