So the question is -

If 3/4 of all the cookies have nuts and 1/3 of all the cookies have both nuts and fruit, what fraction of all the

cookies have nuts but no fruit?

**3/4 of all the cookies have nuts**?

So, 3/4 of all the cookies have **only?** nuts (but no fruit or might have fruit?)

1/4 of them have both nuts and fruits (this is clear)

So if we have 60 cookies

3/4 of them i.e, 45 have nuts (only nuts?)

1/3 of them i.e, 20 have both nuts and fruits

I searched for this problem in gmatclub forum, deduction for cookies with only nuts and no fruits

is to subtract 45 - 20 (I didn’t get this part)