Target sell 24 bottle of water for$3, and 36 bottle of water for $4. which is the batter buy and how much?

Probably the 36 for 4$, but it also depends on the fluid OZ's of the bottle.

Well, the $3 pack is giving you 24 bottles at 8 cents each. The $4 pack is giving you 36 bottles at 9 cents each. The 36 is a better deal because you're getting 12 more bottles of water than you get in the $3 pack for a better price.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.