This problem can be simply solved by putting everything into fractions. Since there's a total of 50 shirts but 35 of them are medium sized then the fraction would be 35/50. You're trying to find the percentage so the 2nd fraction would be out of 100 so it would be ?/100. 35 ? ---- = ---- 50 100 Now you diagonal multiplication then downwards division. 100 x 35=3500 3500/50=70 So your answer is 70%!! :D Hope this helps a bunch!!!