Here's the question you clicked on:
katybugxx
In a group of 55 people, 33 are coffee drinkers and 12 are tea drinkers. Assuming that no one in this group drinks both tea and coffee, what is the probability that a person picked at random from the group does not drink tea or coffee?
since 45 people of 55 drink either tea or coffee u know 10 people dont drink either so u divide 10 by 55
then multiply by 100 to get a percentage