What is the total number of integers between 100 and 500(exclusive) that are divisible by 5? Pick one.
A) 51
B) 63
C) 79
D) 66
E) 42
105, 110, 115, ..., 490,495   This is an equally spaced list; you can use the formula:   n = (largest - smallest) / ('space') + 1 = (495 - 105) / (5) + 1 = 78 + 1= 
<gadget id="calculator">78 + 1</gadget>
<output>79</output>
79   Answer is 79
<result>C</result>
What is the total number of integers between 100 and 500(exclusive) that are divisible by 5?