navigator123 wrote:
Each of the products produced yesterday was checked by x or y. 0.5% of the products checked by x are defective and 0.8% of the products checked by y are defective. If the total defective rate of all the products checked by x and y is 0.75%, what fraction of the products was checked by y?
A. 3/5
B. 5/6
C. 7/11
D. 4/5
E. 5/8
0.5X + 0.8Y = 0.75 ( X + Y )
=> 0.05 Y = 0.25 X
=> Y / X = 5 / 1
Fraction = 5/6
Answer : B
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