Direction.
DIRECTIONS (Qs. 21-25) : In the following questions two equations numbered I and II are given. You have to solve both the equations and give answer.
7x + 6y + 4z = 122
4x + 5y + 3z = 88
9x + 2y + z = 78
x < y = z
x <= y < z
x < y > z
x = y > z
Correct Answer :
A. x < y = z
7x + 6y + 4z = 122 (1)
4x + 5y + 3z = 88 (2)
9x + 2y + z = 78 (3)
From (1) and (2) => 5x 2y =4 (a)
From (2) and (3) => 23x + y = 146 (b)
From (a) and (b) => x = 6, y = 8. Put values in eqn (3) =>
z = 8
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