30+18=30+6y
18=6y
y=3 so the answer is 3
According to your graph, it appears that the <span>maximum number of hot dogs eaten in a hot dog eating contest would most likely be C. 66</span>
The answer is 93
If we sorted out the number of each hours, the sequence will look like this
57 _ 69 _ 81 _ x _ 105
(in which x is the fourth hour of work)
We can see from the sequence that each hours, the mailman add additional 12 letters.
(69 - 57 = 12)
(81 - 69 = 12) . . . . proof
So, the amount of letters on the fourth hour would be:
81 letters + 12 letters = 93 Letters
