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?
How Many Students Drink Neither Milk Nor Coffee?
Mon, Aug 3, 2009
One Response to “How Many Students Drink Neither Milk Nor Coffee?”
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August 3rd, 2009 at 1:53 pm
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.