Question

In Ms. Smith's class, the ratio of students that walk to school to students that take the subway is 1:2. The ratio of students that take the subway to students that take the bus is 1:3. If 3 students walk to school, how many students take the bus?
  A. 6 students B. 18 students C. 9 students D. 8 students

Answer 1

Let y and z be the no. of students that walk to school, that takes the subway and that takes the bus

We have,
3/y = 1/2
=> y = 6 --- (1)

and,
y/z = 1/3
=> y/z = 1/3 [from (1)]
=> z = 18
Hence the no. of students that takes the bus are 18 students

Answer 2

Answer: student A

Step-by-step explanation: