There are: 100/15 = 6 with a remainder of 10
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550 divided by 15 equals 36 with a remainder of 10.
That depends what those 15s refer to. Are they 15 centimetres? 15 metres? 15 inches? 15 miles?
14 of them will work because: 150 (10 x 15) + 60 (4 x 15) = 210. So I hoped you like this explanation!!
There are infinitely many ways to get to 100.