Question
There are 15 numbers such that average of first 12
numbers is 35 while the average of last five numbers is 52. Find the 12th number, if the ratio between 11th and 12th number is 5:3, respectively.Solution
Sum of first 12 numbers = (12 x 35) = 420 Sum of last 5 numbers = (52 x 5) = 260 Sum of 11th and 12th number = (420 - 260) = 160 So, 12th number = 160 x (3/8) = 60
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