Can you spot the hidden girl in the picture below?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

In the image given, you can find several triangles. Can you count them all?

In the picture given below, can you find out which digit will take place of the question mark?

The more of this there is, the less you see. What is it?

Through your logical capabilities, can you make 7 an even?