What is the sum of the multiples of 5 from 80 to 140, inclusive?	Pick:
A) 560 B) 780 C) 990 D) 1008 E) 1200
The formula we want to use in this type of problem is this:   Average*Total Numbers=Sum   First, find the average by taking the sum of the F + L number and divide it by 2:   A = (F + L)/2   Second, find the total numbers in our range by dividing our F and L numbers by 5 and add 1.   (140/5) - (80/5) + 1   Multiply these together so what we show Average*Total Numbers=Sum   (80 + 140)/2 * (140/5) - (80/5) + 1 = Sum   110 * 9= 
<gadget id="calculator">110 * 9</gadget>
<output>990</output>
990   990
<result>C</result>
What is the sum of the multiples of 5 from 80 to 140, inclusive?