Question
There are 15 numbers such that average of first 12
numbers is 60 while the average of last five numbers is 75. Find the 12th number, if the ratio between 11th and 12th number is 11:4, respectively.Solution
Sum of first 12 numbers = (12 X 60) = 720 Sum of last 5 numbers = (75 X 5) = 375 Sum of 11th and 12th number = (720 - 375) = 345 So, 12th number = 345 X (4/15) = 92
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