Answer:
1/10 of the class
Step-by-step explanation:
We already know:
Determining the fraction of the total students rides on school bus
[tex]\implies\dfrac{7}{10} = \text{Walk}[/tex] [tex]\dfrac{10}{10} - \dfrac{7}{10} = \boxed{\dfrac{3}{10}} \ \text{students remain}[/tex]
[tex]\implies\dfrac{1}{5} = \dfrac{2}{10} = \text{Ride bikes}[/tex] [tex]\dfrac{3}{10} - \dfrac{2}{10} = \boxed{\dfrac{1}{10} }\ \text{student remain}[/tex]
Thus, 1/10 of the class rides on the bus.