Question

A company makes 140 bags.

48 of the bags have buttons but no zips.
49 of the bags have zips but no buttons.
23 of the bags have neither zips nor buttons.
How many bags have zips on them?

Answer 1

`48 + 49 + 23 = 120`

So I guess 20 bags have lost

What ever if we suppose even one of them has zip then there are 49 bags that have zip at least.