If each term in the sum a1+a2+a3+.....+an is either 7 or 77 and the sum equals 329, which of the following could be equal to n? Choices:	A) 37	B) 38	C) 39	D) 41	E) 42
Since, there is no 47 in the answer choices (329/7 = 47), we know there is at least one 77.   329 - 77= 
<gadget id="calculator">329 - 77</gadget>
<output>252</output>
252   252/7= 
<gadget id="calculator">252/7</gadget>
<output>36</output>
36   36+1= 
<gadget id="calculator">36+1</gadget>
<output>37</output>
37.   If 37 wasn't there, I would have subtracted 77 from 252 and continued in a similar way.   Ans. 37
<result>A</result>
If each term in the sum a1+a2+a3+.....+an is either 7 or 77 and the sum equals 329, which of the following could be equal to n?