Ican buy 10 gallons of paint for $55. how many gallons can i get for $30?

First you need yo figure out how much each gallon of paints costs. so divide 55 by 10.  55/10=5.5. So each gallon costs $5.50. After that you divide 30 by 5.5 to get the amount of paint you can buy for $30.00.   30/5.5=5.45454545..round that to get 5) so you can buy 5 gallons of paint for $30

The first one is 2/3the second is 1/160the third is 4/125