Question

Write a question that matches this equation.

45 – n = 15

Answer 1

15 + n = 45, hope you get it, thanks. When you take one number to the other side of the equal sign, you have to reverse the operation, according to Indian Math curriculum.

Answer 2

"15 is equal to 45 minus what value, n?"
That is a very simple way of wording it. I think thats what you were asking for