The number we need

What with Summer around the corner, here is the answer to the question everyone is asking.

From Business Insider:

Here's how much ice you need to cool your beer, according to math
The best way to get your drinks cold is to put them in a cooler with some ice.

Here is the question: How much ice do you actually need to get your drinks cold?

Let me start with some assumptions.

Suppose you get n drinks and these start at room temperature. Let me say room temperature is 22 °C (about 72 °F).

You start with ice and drinks. The ice is just at 0 °C.

Some math here and then, the answer

Instead of determining the amount of ice, suppose I purchase a 10-pound (4.5 kg) bag of ice? How many drinks would this cool down? Using the same calculations above, I get eighteen drinks.

So, what is the answer? I think I would recommend one 10-pound bag for every twelve drinks. This way, not all the ice will melt and you can keep your drinks cool for a longer period of time.

A bit less if you can pre-chill the refreshing beverages in a fridge first.