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"Disinterested" means unbiased or having no personal stake in the matter. In sentences I and III, the word is used correctly to describe someone's lack of personal interest. In sentence II, the word is used incorrectly; "disinterested" should mean unbiased, not someone without a personal stake.
The average of 9 numbers is 100. The average of the first 4 numbers is 65 and the average of the last 4 numbers is 40. What is the 5th number?
The average cost of three chairs is Rs.10000. The average cost decrease by 12% when one more chair is included. What is the cost price of the 4th