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

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

In the formation, you can see a few arranged matchsticks. Can you form three squares by moving just three matchsticks?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

You can see three almost identical images below. Can you spot the odd one out from them?

Can you identify if it's a murder or a suicide ?

Which is the rope you never skip with?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

What is the next number?

77, 49, 36, 18 ?