Gmat Prep 2

abhinav85 wrote:Is the average (airthmetic mean) of 5 different postive integers at least 30?

a.Each of the integers is a multiple of 10.

b.the sum of the 5 integers is 160.



D

1) the smallest multiple of 10 is 10. To take the smallest average, you can take consecutive multiples of 10: which in this case would be 10, 20 30, 40, 50.

avg of this set is (50+10)/2 = 30 SUFFICIENT.

2) is obvious. 160/5 = average which is > 30 SUFFICIENT.

(D)

At first glance the answer seems to be B here...
So after reading the question properly...
The trap here is that the question is stating that the integers are different...
If you ignore the different then the answer will be B which is wrong...

the question is asking if the sum of the integers is 150
Statement 1
The least possible value with the given condition is 10+20+30+40+50=150
Sufficient
Statement 2
160/5>30
Sufficient
Answer D
[/b]

Ya Robin

You rite dude............i missed that trap.......damn!!!

I chose B as my option.

Thx man.

For what its worth I think the trap is in the word 'atleast'.

1)says the different integers are multiples of 10, they could easily be 120, 130, 140, 150, 160 - in which case average would be much higher.

2) Is obvious as pointed out

(D)