If (x-1) / (x +1) = (7/9), then x =?(a)6 (b)7 (c)8 (d)10 – InterviewSolution

1.

If (x-1) / (x +1) = (7/9), then x =?(a)6 (b)7 (c)8 (d)10

Answer»

(c) 8

Because,

= (x-1) / (x +1) = (7/9)

By cross multiplication,

= 9 × (x-1) = 7 × (x +1)

= 9x -9 = 7x + 7

= 9x -7x = 9 + 7

= 2x = 16

= x = (16/2)

= x = 8

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