Mashaal Masha
For a camping trip a group bought $\bm{x}$ one-liter bottles of water and $\bm{y}$ three-liter bottles of water, for a total of 240 liters of water. Which equation represents this situation?
Difficulty: Easy
A: 

$x+3y=240$

B: 

$x+y=240$

C: 

$3x+3y=240$

D: 

$3x+y=240$

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