Some questions in IQ, Pleeeeease

Please, i need your help in the following questions in IQ from

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1- 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?

(10 - 15 - 17 - 18 - 20 )

2- Grandma sent Johnny some money for his birthday. Johnny spent all of it in five stores. In each store, he spent $1.00 more than half of what he had when he came in. How much money did he get from grandma?
($7.50 - $25 - $30 - $46 - $62 )


3- Your teenage daughter Sally and her friend Monica invented a secret alphabet. You find a note that Sally wrote for Monica using this secret code. Sally tells you that it says:
Hi Monica,
Yesterday, ?????? asked me out. Sally

You desperately want to know who the guy is, but she won't tell you. Can you figure out his name from the note?

Ls Ucvskj,
Tbdfboqjt, Ujofsv jdmbq ub cxf. Djppt


4- Light is to window as air is to:
Wind - Suffocation - Breath - Filter - Atmosphere


5- Let's say that the following arguments are true:
All sales are cheats.
No cheats are bargains.
Therefore, we can conclude that no bargains can be sales.
Is this conclusion true or false?