The average income of 3 friends in a group of six is Rs. 6,600 and that of the other two is Rs. 6,500. If the average income of all the six is Rs. 6,400, find the income of the 6th friend.
Sol : Average Income of 3 Friends = Rs. 6,600 So, Total Income of 3 friends = 3 X 6,600 = Rs. 19,800
Average income of 2 friends = 2 X 6,500 So, Total income of 2 friends = 2 X 6,500 = 13,000
Total income of 5 friends = Rs. 19,800 + Rs. 13,000 = Rs. 32,800
Average Income of 3 Friends = Rs. 6,600
So, Total Income of 3 friends = 3 X 6,600 = Rs. 19,800
Average income of 2 friends = 2 X 6,500
So, Total income of 2 friends = 2 X 6,500 = 13,000
Total income of 5 friends = Rs. 19,800 + Rs. 13,000
= Rs. 32,800
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