If a litre of water is provided for 20 people, how much for 50 people?

2.5 L

Step-by-step explanation:

We use a rule of three to solve this problem, the information we have is represented as follows:

Liters       People

   1       ⇒    20

   x       ⇒    50

x represents the unknown quantity, the liters that correspond to 50 people.

The way x is found is as follows: We multiply the cross quantities and divide by the remaining quantity.

Thus, for 50 people is provided 2.5 liters of water

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