The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you find the company name in the pictogram below?

Who is that with a neck and no head, two arms and no hands? What is it?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Find the smallest sentence with all the English alphabet.

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?

Can you count the number of matches in the picture below ?

What has 88 keys?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?