Guys I was solving a question and I made this silly mistake.I corrected myself but was hoping somebody throw some light on where my concept was wrong.
Suppose 2/3 out of N employees dring regular coffee.Out of these 2/5 add cream.How many of the employees who drink regular coffee do not add cream?
Ans: 2/3n - 2/5n = 4n/15.(ans.)
What I did was:If 2/5 add cream,then 3/5 do not add cream.So 3/5 x 2/3n = 2/5n
Catch some light.
Sorry, can't help !
When you say 2/3 employees of total. It is \(2N/3\).
When you calculated 3/5 = do not add cream. It means \(3N/5\) do not add cream. It's \(3/5\) of total employees & not \(3/5\) of 'the employees who drink regular coffee'.
Let's say \(Y = 2N/3\) = employees who drink regular coffee.
You are supposed to multiply \(3/5\) to 'N' not to Y.
P.S. You can draw a venn diagram, if you are still confused. I am too lazy to draw one on Monday morning. :yawn:
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