I'm not able to solve this problem that appears as Question 23 on the queendom Classical IQ Test. Could someone please help? One hundred businesspeople gather at a meeting. 85 of them carry a cellular phone, 80 of them have a beeper, 75 of them speak at least two languages and 70 of them wear a suit. Therefore, a certain number of them have all of the above: a cell phone AND a beeper AND speak at least two languages AND wear a suit. Out of these 100 businesspeople, what is the least possible number who have all of the above? The choices are: 10 - 15 - 17 - 18 - 20.