A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

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

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

I am quite hot but become too cold if you remove the first two letters. What am I?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

What jumps when it walks and sits when it stands?

Find the value of "?" in the ball picture Riddle below:

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?