If each term in the sum a1+a2+a3+.....+an is either 7 or 77 and the sum equals 357, which of the following could be equal to n? Choose the correct choice from the following: A) 38 B) 39 C) 40 D) 41 E) 42
Since, there is no 51 in the answer choices (357/7 = 51), we know there is at least one 77.   357 - 77= 
<gadget id="calculator">357 - 77</gadget>
<output>280</output>
280   280/7= 
<gadget id="calculator">280/7</gadget>
<output>40</output>
40   40+1= 
<gadget id="calculator">40+1</gadget>
<output>41</output>
41.   If 41 wasn't there, I would have subtracted 77 from 280 and continued in a similar way.   Ans. 41
<result>D</result>
If each term in the sum a1+a2+a3+.....+an is either 7 or 77 and the sum equals 357, which of the following could be equal to n?