What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

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

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

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