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?
This is a allegation problem.
We can use a shortcut.
See the attachment for the shortcut.Its a simple one
So X/Y = 0.05/0.25 = 1/5
Therefore the fraction of products checked by Y = 5/6
File comment: The shortcut
untitled.JPG [ 4.43 KiB | Viewed 445 times ]
"Kudos" will help me a lot!!!!!!Please donate some!!!
Official Quant Review
OG - Quant
Official Verbal Review
OG 13th ed
Yet to do
100 700+ SC questions
Verbal is a ghost. Cant find head and tail of it.