mr. parra brought a coffee to school this morning. after first period, he only had 15% of the coffee left. if he had 210 mL of coffee remaining, how much coffee did he begin with?

Step-by-step explanation:

First we have to find their hourly rate. We do this by dividing their total over 4 hours by 4 to get over just 1 hour.

60 / 4 = 15

Now we divide their total of $210 by their hourly rate of $15 to find how many hours it would take.

210 / 15 = 14

I would take 14 hours to earn $210.  

If im right brainliest plz

Hope this helps :)

it would take 7/10 of an hour too fill the pool.

step-by-step explanation:

the answer is b