Question

There are four unknown numbers. the mean of the first two numbers is 4 and the mean of the first three is9. the mean of all four numbers is 15 .if one of the four number is 2 find the other numbers.

Answer 1

Here is your answer :
1st Number = 2
2nd Number = 6
3rd Number = 19
4th Number = 33

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Answer 2

let a, b, c and d is the four numbers...
a+b / 2 =4--(1), a+b+c / 3 =9---(2), a+b+c+d / 4 =15----(3)
if one of the four number is a=2,
from (1),,
2+b=8==>b=6
substitute a=2,b=6 in (2),,
2+6+c=27==>c=27-8==>c=19
substitute a=2,b=6,c=19 in (3),,
2+6+19+d=60==>d=60-27==>d=33..

the four numbers are a=2,b=6,c=19 andd=33...yes it's probability question. I know...

hope it will help u.... thnx for seeing my answer