The answer is 24/10 -1 3/5 = -8/5 -2/3=-3/2 -8/5 times -3/2 = 24/10 When we divide fractions we have to flip the second fraction , then we multiply the fractions , the answer is not negative because a negative times a negative equals to a positive.
You need to find out how many problems Carl can do in a minute (unit rate), which is 20/55 or .36363636363. If you multiply it by 75 mins, you get 27.27, so the answer would be 27.
