Register free in 2 easy steps
Forgot Password

Here is the Solution

 

Step Up!

I started going down a staircase. Having gone down 4 steps I saw X coming up. For one step that I take X goes up by two steps. I met X on the way going down. When I still had 7 steps to go down, X had gone up. Find the number of steps in the staircase.

SOLUTION : 22

Let total number of steps be n. When X started coming up, i had covered 4 steps already and when X has reached top, i still had 7 steps to go.

In the same time, X has covered n steps and i have covered n-11 steps. If speed of X is twice that of mine, n = 2(n-11)

Back to all the Puzzles