[PPSC SCIENTIFIC ASSISTANT (POLYGRAPH)]

11. A frog jumps out of a dried well 4.5 meters deep with slippery walls. Every time the frog jumps 30 centimetres, slides down 15 centimetres. What is the number of jumps required for the frog to come out of the well?

1. 28

2. 30

3. 29

4. 31

Correct Answer :

30