stonecold wrote:
If the Average of 10 consecutive integers is 19.5 then the 10th integer is :-
A) 15
B) 20
C) 23
D) 24
E) 25
I usually use more formal solving methods. This time I wrote
19.5
then
19 (19.5) 20
then
15,16,17,18,19 (19.5) 20, 21,22,23,24
Not even half a minute. Okay, yes, you have to know that mean = median in consecutive integers, and that there will be five integers on each side of the mean, but ... maybe scribbling has its merits.
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