It's a friendly metaphor, not real coffee. Each "coffee" is $5 and you can buy as many you like.
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About John Tranter
Free Mathematics online exercises, puzzles and games.
It has been my passion for many years to share the resources I have developed for teaching Mathematics. I hope you can make good use of them and share the free exercises, puzzles and games with those who might appreciate them.
Recent supporters
Malika Chandoo bought 4 coffees.
Thanks for all that you do! It is very much appreciated by teachers
That's very kind of you Malika. I really will enjoy drinking those coffees!