Quantitative Aptitude :: Partnership - Discussion

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Explanation:
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