Gasoline costs $3.95 per gallon. Which graph correctly shows the number of gallons bought for $7.90?

How do i do this activity, is appreciated

Aschool had an election where the candidates received votes in the ratio 1: 2: 3. if the winning candidate received 210 votes, how many total people voted in the election?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.