Astandard hot tub holds 2.3 kiloliters of water. after filling up two of nine hot tubs, johnson's water service truck empties. how many liters of water are still needed to fill the remaining tubs

2.3 kiloliters x 1000 liters per kiloliter= 2300 liters.
We know that 2 hot tubs of 2300 liters have been filled, so that means a Johnson water service truck holds 4600 liters of water (2300 x 2). Since there are 7 more tubs to fill (9-2), the equation for the total number of liters required is 2300 liters x 7 tubs= 16100 liters. Take this number and divide it by the amount of water in each truck (16100/4600) and you get 3.5. Since you cannot have half a truck, and you need at least 3 trucks, you have to round up to the final answer of 4 trucks.

The length is 23 and y because you add them together