Explanation : (D) If the ratio is 1 : 4, Then the number of defective bulbs = x and number of good bulbs = 4x
∴ x + 4x = 12
⇒ 5x = 12
which is not possible for any integral value of x.
So, 1 : 4 is not possible.
Explanation : (D) Let the production of Y =100
Then, production of X =120
Production of Z =150
Required ratio of X, Y and X
=X : Y : Z
=120 : 100 : 150
=12 : 10 : 15
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