Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Which five letter word can be added at the end of below word to form a
valid word?

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Can you count the number of triangles in the given figure?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Can you find out the remainder when 3^300 is divided by 5?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?