What is the sum of the multiples of 7 from 77 to 91, inclusive?  Choose the correct answer:
A) 260	B) 452	C) 352	D) 260	E) 252
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 7 and add 1.   (91/7) - (77/7) + 1= 
<gadget id="calculator">(91/7) - (77/7) + 1</gadget>
<output>3</output>
3   Multiply these together so what we show Average*Total Numbers=Sum   (91 + 77)/2 * 3 = Sum   84* 3= 
<gadget id="calculator">84* 3</gadget>
<output>252</output>
252   252
<result>E</result>
What is the sum of the multiples of 7 from 77 to 91, inclusive?