hey guys just need help with some homework, and if someone can explain how to find the "x doesn't equal" part of the problem it would be much appreciated

Carter drank 15.75 gallons of water in 4 weeks. he drank the same amount of water each day.a. estimate how many gallons he drank in one day.b. estimate how many gallons he drank in one week.c. about how many days altogether will it take him to drink 20 gallons?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30