TeHCM wrote:

krisrini wrote:

MBAHopeful wrote:

What is the average of eleven consecutive integers?

1) average of first 9 integers is 7

2) average of last 9 integers is 9

The consecutive integers could either be of the increasing sequence or the decreasing sequence.

I neglected to include decreasing sequence.

However, I think you may have made a mistake in your working.

In the decreasing sequence, (1) it should be 9x - 54 = 63 ==> x = 13

So the first term is still 3.

Similar working for (2)

I am not able to find the mistake.

Increasing seq-> x,x+1,x+2,x+3,x+4,x+5,X+6,X+7,X+8,X+9,X+10.

Decreasing seq-> x,X-1,X-2,X-3,X-4,X-5,X-6,X-7,X-8,X-9,X-10

From stmt1 we get 2 equn

a) For increasing 9x+36 = 63 => 9x = 27 => x= 3

b) For decreasing 9x - 36 = 63 => 9x = 99 => X = 11

From stmt we get 2 equn

a) For incresing 9x+54=81=> 9x= 27 => x = 3

b) For decreasing 9x - 54 = 81=> 9x = 135 => x = 15

So comibing it is still 3.

If you have time can you tell me where am i making a mistake.

Thanks a ton.

regards