Maths question: Ratio and difference, cashew nuts and peanuts

This is a difference / ratio question.

In a packet of mixed nuts, 40% are cashew nuts while the rest are peanuts.After 12 cashew nuts are removed from the packet and 24 peanuts are added, the cashew nuts make up 33 1/3% of the nuts in the packet. How many cashew nuts are there in the packet now?

There are several ways to solve this. Here are 4.

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