Well, simplifying this is actually quite easy with just dividing in general. 15/60 is one of those numbers where the numerator can go into the denominator evenly, in this case it can go in 4 times, because 15 x 4 = 60. So you must do 15 divided by 15, which is 1. Next, do 60 divided by 15 which is 4. so 1/4 is your answer, and it impossible to simplify more with whole numbers for the answer. Hope I could help out!