The answer is 3. First simply 5/10 to 1/2. Then convert 3 1/2 to an improper fraction, by multiplying 2*3 and then adding 1, then put answer 7 over 2. Next simply 4/8 into 1/2. Subtract 7 and 1 and get 6. put 6 over 2 and dic=vide to get your answer which is 3.