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

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

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Can you replace the question mark with the correct number in the below table sequence?

Can you solve the maths in the below-given picture equation?

John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?

Can you count the number of squares in the figure below?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?