In a certain alphabet, 12 letters contain a dot and a straight line. 24 letters contain a straight line but do not contain a dot. If that alphabet has 40 letters, all of which contain either a dot or a straight line or both, how many letters contain a dot but do not contain a straight line?
Unable to understand the question itself!!!!!!!
Check below matrix and ask if anything is unclear there:
Numbers in black are given and numbers in red are calculated.
Hope it helps.
Bunuel. Thanks mate. I did the same matrix above but please explain the "4-0".