So the question is what is 1/5 of 25 or in other words what is one fifth of 25. To see that we need to chop down the number 25 into fifths and to do that we simply divide 25 by 5. So now we see that 25=5 + 5 + 5 + 5 + 5 so the answer is 1/5 of 25 is 5.