In a restaraunt, there are 3 popular dishes A, B and C . On a given evening, 71% of the diners ate Recipe A, 84% ate B and 86% ate C. The percentage of diners who ate all the dishes must be greater than what what number?
Let's look at it this way, what's the least pssible number of eaters who ate 3 dishes.
we have 71+84+86=241
for the least of 3 dishes eaters, we have maximum eaters of 2 dishes, that's 200
we're left with 41. so it must be greater than 40, D.