Our product and our sum always give the same answer. Who are we?

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?

Different lights make me strange by changing me into different sizes. What am I?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

The more you take me, the more you leave me behind.
Who Am I?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Find the next number in the series.
1 10 24 43 67 ?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Which digit occurred maximum times between the number 1 and 1000?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?