True Output

How many students drink neither milk nor coffee?

A school has 800 students. Of these, 400 students drink milk and 300 students drink coffee. 150 students drink both milk and coffee. How many students drink neither milk nor coffee?

Public Comments

1. Let's represent this as a set. The universal is 800. If 400 people drink milk, that means 150 of them must also drink coffee, as that amount is in the intersection set. The same goes for coffee. From this we can gather that 250 drink milk only and 150 drink coffee only. Milk only=250 add coffee only(150) = 400 Add intersection = 550 Subtract from 800=250 Your answer is 250.