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

How many triangles are there on the puzzle below?

The centre of the third figure is empty. What digit should fit inside?

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Can you write down eight eights so that they add up to one thousand?

How many letters are in the alphabet?

What's the next in the series?

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

Count the Triangle in the figure given below: