What is next number in the pattern below:

131 517 192 123 ?

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

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

What does this rebus riddle means ?

I don't get anymore wetter, no matter how much rain falls on me.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)