If you can buy 1/2 of a gallon of milk for 3 dollars, how many gallons can you buy for 5 dollars? write your answer as a fraction of a gallon.

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?

Me i’m stuck on all these questions besides the two bottom ones