Plants to Water

I have two large plants to water. A liter of water lasts 14 days if I use it on the first plant. It lasts 10 days if I use it on the second plant. How long would it last if I used it for both plants?

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If I use my liter to water both plants, on the first day I will use of the liter.

In 5 days I’ll use of the liter, with left — not quite enough for the sixth day.

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