What has to be broken before you can use it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

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?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

What came first, the chicken or the egg?

What Deficiency does the below rebus represent?

VIT_MIN

What brings you down but never up?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?