MHB How to Make 24 with 21, 20, 22, and 6 Using Basic Operations?

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How to make 24 with the numbers 21, 20, 22, and 6 each once using only addition, subtraction, multiplication, and division? If only the number 22 was replaced with 23 I could do that, but how can I do it with the given numbers?

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Never mind, I get it. It's 21 + 6 : (22 - 20). Can't believe I am this stupid.
 
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How about:

$$21+\frac{6}{22-20}=24$$
 

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