In a fraternity with 37 members, 18 take mathematics, 5 take both mathematics and chemistrychemistry, and 8 take neither mathematics nor chemistrychemistry. how many take chemistrychemistry but not mathematics?

37 students in total, there are 8 who do not take math or chemistry then there are 29 taking mathematics, chemistry or both (37-8 = 29).Now subtract this amount  those who take math and those who take both, so you have 29-18-5 = 6 only take chemistry (chemistry but not math)

3x+9+4x+x=8x+9that's the answer for your question.

If there are four friends then each would get, 1.25 or 1 1/4. so this is how i solved 5 ÷ 4 = 1.25 . hope this ; )