In some questions if I will write something it will tell that it is wrong instead of writing the correct - Maths - Addition and Subtraction

Question

In some questions if I will write something it will tell that it is
wrong instead of writing the correct answer Is there a format to
write the answer If there it is then please tell me the format

Priyanka Kedia · Accepted Answer

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In some questions if I will write something it will tell that it is wrong instead of writing the correct answer . Is there a format to write the answer . If there it is then please tell me the format .