As sheep can be eaten by leopard then suppose first leopard eats sheep and turns into sheep ,then this sheep is eaten by other leopard and so on.At the end there is only one sheep is remaining which was the the last leopard and sheep’s combination.

This question was asked to me in my Deloitte Interview.It follows as:

1)First ON the first switch. Wait for some time .
2)Now Switch OFF the first switch and ON the second switch.
3)Now go to the room and check if the bulb is glowing (Which means that Second Switch is answer)  , or it is warm (which means First Switch is answer) or Neither(Which means third is the answer).

Tip::Never tell the answer directly .Try to tell many approaches and at the end or in middle tell the answer you can try this approach too.

Canonical answer to this problem would be that the man is a Dwarf. We can conclude this because on rainy day he had Umbrella and when other people are in elevator then they will help him. Other  days he has none.

72
Space available today is of buses in the garage only.Let that be x.  Number of buses today =x+12

Now given that  0.4x=12+12
->                             x=60

Thus Number of buses=60+12=72