The 9 students in the Environmental Club represent 20% of the students in the seventh grade. How many students are in the seventh grade? Multiply/scale up to solve. students 9, 20, 100 percent

45

Step-by-step explanation:

suppose that x is the number of students in the seventh grade

9=x*0.2

x=9/0.2

x=45

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5