The number of eighth graders in choir is three times the number of seventh graders. if there are 48 eight graders in choir, how many seventh graders are in choir?

16

Step-by-step explanation:

Let's say the number of 8th graders is x, and the number of 7th graders is y.

x=3y

We know that there's 48 8th graders, so

48=3y

48/3=16, so there are 16 7th graders.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20