2 years ago

The sum of a number and twelve is 21 what is the number. Pls help fast!

Mathematics

2 answers:

monitta2 years ago

6 0

Answer:

Step-by-step explanation:

In order to find what needs to be added, you can subtract the number your already have. In this case, subtract twelve from twenty-one.

21 - 12 = 9

To check, we can add nine to 12 and see if it works.

12 + 9 = 21 is correct.

So 9 is our answer.

Brainliest please?

Alex2 years ago

3 0

21-12

so sum of 12 and 9 is 21

n= 9

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