Exactly 8 of them
18.53
678
Seven of them.
15s-15 = 0
550 divided by 15 equals 36 with a remainder of 10.
Five times.
2
120 ÷ 6 = 20
120/15 = 8
The coordinates 15S, 75W represent a location in Peru, in or near Poroma on the Panamericana Sur.
Two 15s' equals 30.