There are three numbers, the average of first two numbers is 2 and the average of the last two numbers is 3, and the average of the first and the last numbers is 4. What is the average of three numbers?
let the numbers be a,b and c
a + b = 4
b + c = 6
a + c = 8
therefore adding all, 2(a + b + c) = 18
or, (a + b + c)/2 = 4.5
let the numbers be a,b and c
a + b = 4
b + c = 6
a + c = 8
therefore adding all, 2(a + b + c) = 18
or, (a + b + c)/2 = 4.5
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