16.2. Every third student in the sixth grade is a member of the math club, every fourth is a member of the history club, every sixth is a member of the chemistry club, and all the others are members of the literature club. How many people are in the chemistry club if there are three more people in the math club than in the literature club?

$$
(6-7 \text { grade) }
$$
16.2. Students attending the literary club constitute $1-\frac{1}{3}-\frac{1}{4}-\frac{1}{6}=\frac{1}{4}$ of the class. If $x$ is the total number of students in the sixth grade, then according to the problem, $\frac{1}{3} x-\frac{1}{4} x=3$, from which $x=36$. Therefore, the number of students attending the chemistry club is $36: 6=6$.