Write an inequality for the sentence. Use x for the variable.

The sum of a number and 12 is at least 25 ...?

It is basically a very easy problem. The trick lies in the manner in which the question is written. The main confusion will be around the words "at least". Let us get down to solving the problem without much fuss. "At least" means that it can be greater than or equal to.

x + 12 ≥ 4

I hope the answer is absolutely clear for you to understand.