Below you can find the full step by step solution for you problem. We hope it will be very helpful for you and it will help you to understand the solving process.

We are looking for a new number which is 20 less than 51.

We will get the new number by subtracting 20 from 51.

We write it down as:

51-20=31

And finally the solution for: What number is 20 less than 51?

is

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