There are 200 people in this marching band, so the denominator is 200. You are attempting to find the amount of people who play a brass insturment, which in this scenerio, 50 people play brass insturnments. 50/200 simplified is 1/4, which is equal to 25%.
The answer is 7/40.
To solve, you have to find the LCM (least common denominator) for 5/8 and 4/5. 5/8= 25/40 and 4/5= 32/40. Subtract and you get 7/40. That is your answer.
