Best Answer

you have to write an algebraic expression.

your number can be any thing you want... lets call it (q)

the sum means you add the numbers. so...

q + 23

the word (IS) in algebra means equal to so...

q + 23 = 20

so what number added to 23 will equal to 20

the answer is negative 3


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Q: What is the sum of a number and 23 is twenty?
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