Given: 1 pail = 4 liters
1 pail = 9 liters

you are going to the river to fetch water. how could you carry 6 liters of water using only this two pails?

note: pails have no permanent calibration.

You just have to do this twice. Fill the 9-L pail using the 4-L pail twice. That gives you 8 L in the 9-L pail. Fill the 4-L pail and pour it to the 9-L pail until its full. That takes 1 L from the 4-L pail and leaves 3 L to that pail. Doing this twice you will get 2*3 = 6 L of water.

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200 miles.45 x 3 (charge per day times days)135$205$ - 135$ = 70$0.35x = 70divide both sides by 0.35200