What occurs twice in a week, once in a year but never in a day?

What number should come in place of the question mark below?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

Can it be possible to build a house that has all its four walls facing towards the South?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Can you find the next number in the sequence?

113 119 101 114 116 ?