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Hello Kittyhacker14! :) I am Grace Rosalia, and I hope my answer wil help you!

First, we must calculate 15% of 300.

We do this like this:

300:100=3

Now we multiply it by 15:

3*15=45

So 15% of 300 is 45. (that's how many students arrive on foot)

Now we must compute how many students arrive by bus (it's done like that:

300*3/5=180 (that's how many students arrive by bus)

Now we must calculate how many students arrive by car.

That's how it's done:

300-180-45=75

So 75 students arrive by car.

50- 250 is correct i did that one too

step-by-step explanation:

853.3

step-by-step explanation: