[ Arithmetic. Mental calculation, etc.]

How many times longer is the staircase to the fourth floor of a house compared to the staircase to the second floor of the same house?
Think about how many floors you need to go up to reach the second floor?

## Solution

To get to the 2nd floor, you need to go up 1 floor, and to get to the 4th floor, you need to go up three floors. Therefore, the answer is: 3 times (and not 2, as it might seem at first).

## Answer

3 times.