If you read the question again, you will probably notice the slight trick used in this question.
25 - 55 + (85 + 65) = 25 - 55 + 150 = 120
Now, 120 is also equal to 5!
5! = 5 * 4 * 3 * 2 * 1 = 120
Yes, we were talking about 5! (factorial) and if you read the question, thats what is written there.