When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

When is the top of a mountain similar to a savings account?

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

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

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

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Solve the counting riddle by identifying the number of triangles in the given picture.

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?