lildezikobe836

No problem arbortrees06...I have time for one more:

Since 6, 7, 16, and 18 are answered I'll do 17:

From 7:15 to 8:45, there are:

1 "on the Hour" (8:00)
2 "Half Hours" (7:30 and 8:30)

That means in the first column, n is 8 because the nth hour is 8:00.

For the "Chimes n Times on the nth Hour," you have: 8 chimes x 10 Type A clocks = 80 chimes and 8 chimes x 5 Type B clocks = 40 chimes.

For the "Chimes Once on the Hour," you have 1 chime x 3 Type C clocks = 3 chimes.

For the "Chimes Once on the Half Hour," you have 2 chimes (remember there are 2 half hours between 7:15 and 8:45) x 10 Type A clocks = 20 chimes and 2 chimes x 3 Type C clocks = 9 chimes.

Now just add the chimes up: 80 + 40 + 3 + 20 + 6 = 149 chimes.