A5. In a class of 30 students, $\frac{2}{3}$ are boys. Each day, at least 1 hour of online chatting is done by $30\%$ of the boys and $60\%$ of the girls. How many students in this class chat online for less than 1 hour per day?
(A) 12
(B) 16
(C) 18
(D) 20
(E) 22

![](https://cdn.mathpix.com/cropped/2024_06_07_35a41305492e4935cdadg-2.jpg?height=651&width=645&top_left_y=1776&top_left_x=1271)
A5. In the class, $\frac{2}{3}$ of $30=20$ are boys and 10 are girls. At least one hour of online chatting is done by $30\%$ of $20=6$ boys and $60\%$ of $10=6$ girls, a total of 12 students. Less than 1 hour of online chatting is done by 18 students.