Question

in a group of 9 people , 8 people pay 30 each and the 9 th people pay 20 more than the average amount of 9 people​

Answer 1

Answer:

Let the 9th person spend Rs x.

Then the total sum spent by the nine people = 30 x 8 + x

= 240 + x.

So the average expenditure = (240 + x)/9.

Now x is 20 more than the average expenditure.

So, x = (240 + x)/9 + 20

Therefore x - 20 = (240 + x)/9

Thus, 9x - 180 = 240 + x

Or, 8x = 420

Or x = 52.50

Therefore total money spent = 240 + 52.50 = 292.50

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