Debra found that 6 of the 24 students in her class own a cell phone. what is the radio of a srudents that own a cell phone to students that do not?

6 out of 24 own a cell phone...that means (24 - 6) = 18 do not own cell phones.

so the ratio of students that own cell phones to students that do not own cell phones is 6/18 which reduces to 1/3 or 1:3 or 1 to 3 <=

1. If it is intersection then it SHOULD be included in both the sets right? Now we know that odd numbers from 1-100 but the second set are multiples of 5 from 50-150! So we mainly need to look for common numbers which are ODD and are a MULTIPLE OF 5 BETWEEN 50 - 100!! So A={51,53,57,59,6199} B={55,60,65,7095} [We stop till 100 because set A has no such element] So what is A ∩ B here? A ∩ B = {All odd numbers and multiples of 5 between 50 - 100}