11-12 year olds

Cosme has a water gun for the summer. Its water tank is half a liter. He was able to get one of his friends wet.

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Then Maria arrives with the same watergun, but the dimensions of the tank are twice as long as Cosme’s.

She begins to shoot water and can wet much more friends than Cosme.

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 Why?

(The masures of each length in the drawing are centimeters)