What goes up but never comes down?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Find the last number in the series below:

voN luJ yaM raM ---

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

Who always enjoys poor health?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Which English verb becomes past tense just by rearranging the letters?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?