RRB Group D 15-Oct-2018 Shift 1 Solved Paper

Question : 56 of 84

Marks: +1, -0

The average of three numbers is 7 . The average of the first two is

5,

whereas the average of the last two is 8 . The three numbers (respectively) are :

Solution:

Let three numbers be

{A}, {B}

and

{C}

respectively
ATQ

∴ A+B+C=21

...( i)

A+B=10

...(ii)

B+C=16

...(iii)
from (i), (ii)

\ \&\ (

iii

), B=5

from (ii)

, A=5

from

(i), 5+5+C=21, C=11

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