How do you do all these problems? don’t do 20 and 21.

17. He needs 2cupsof flour to make 20 biscuits so he needs x cups if flour to make 30 biscuits


So he needs 3 cups of flour to make 30 biscuits.
So the answer is B

18. She charges 30$ for 2 hours so she charges x$ for 5hours.


so she charges 75$ for 5 hours.
So the answer is I

19. (an hour is 60 minutes)
She walks 2 blocks in 15 minutes so she walks x blocks in 60 minutes.


So she walks 8 blocks in 60 minutes.
So; the answer is: 8

please mark as brainliest.