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Thought blocker

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Yeah and this is the explanation from the link you gave :p

1. A (Estimated Difficulty Level: 4)
The first nine terms of the sequence are:
n, n + 5, n + 10, n + 15, . . . , n + 40.
(You should probably write all nine terms out to avoid
mistakes.) Adding these terms up gives: 9n + 180. The
average is the sum (9n + 180) divided by the number of
terms (9). The average is then: (9n + 180)/9 = n + 20.
then what did I copy paste? ;/
 

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General question
Sherlock Holmes, who is a detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:
710 57735 34 5508 51 7718
Read it!
 

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c6e8b8735a.da4b9237ba.4xvQRZ.png

Which of the following fractions, when added to the sum of the above numbers, make the result a whole number?

a) 51/60

b) 53/60

c) 7/60

d) 1/60

e) 0
 
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