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Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?

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Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Clapping Times

Age 5 to 7
Challenge Level

Sam from Hitchin Boys' School, wrote in with a general solution to this problem:

My solution is that all the numbers that are a factor of neither of the numbers you use will be quietest.
The numbers that are factors of either but not both will be the middle volume and the numbers that are factors of both will be loudest.

That's very clearly put, thank you Sam.