Can you please add the picture with the problem, then I will answer your question ?
I think I could help you
Have fun and feel free to ask me something new.
Or we can prove some properities without calculating by details
Answer:
16 seconds per download
Step-by-step explanation:
480/30 = 16 seconds
Download photo math and put the problem into it it will solve it
2.1 ounces because you divide 21 by 10 which equals 2.1