As given in the question,
Number of cans collected daily from Monday to Thursday = 10
which gives 4 days so total collected cans in 4 days = 40
Number of cans collected on Friday = 18
So, total cans collected from Monday to Friday = 40 + 18 = 58 cans
Now, the expression written by Carol is = 4(10)+18
Now solving this also we get
40 + 18 = 58 cans.