At a particular school with 43 students, each student takes chemistry, biology, or both. The chemistry class is three times as large as the biology class, and 8 students are taking both classes. How many people are in the chemistry class?
+605 Draw a venn diagram. Let there be $x$ students taking only chemistry and $y$ taking only biology. Then $(x+8)=3(y+8)$ and $x+y+8=43$. Now solve this, and the answer will be whatever $x+8$ is.
+1693 (43 + 8)/4 = 12.75 
x + 3x - 9 = 43 x = 13 3x = 39
x + 3x - 5 = 43 x = 12 3x = 36
x + 3x - 8 = 43 x = 12.75 3x = 38.25 Wrong!!!
+1693 At a particular school with 43 students, each student takes chemistry, biology, or both. The chemistry class is three times as large as the biology class, and 8() students are taking both classes. How many people are in the chemistry class?
It's NOT 8 !!!
It's either 5 or 9.
(43 + 5)/4 = 12 chemistry class = 3 * 12 = 36
(43 + 9)/4 = 13 chemistry class = 3 * 13 = 39
