Question

answer. 5 plsssSssssssssssssss

Answer 1

let age of third bro be x
x+12+15/3=15
x+27=15*3
x=45-27=18yrs.
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Answer 2

Let the age of third brother is x
Then,
average of three brothers =( 15 + 12 + x) /3 = 15
(27 + x) = 45
X = 45 - 27
Hence, x =18