Let grasshopper takes n jumps to climb the wall. Actual distance covered by grasshopper =36−20=16cm After his last jump grasshopper will climb the wall. So, no sliding back for last 36 cm . Now, we will subtract 36 cm from 340 cm to get sliding distance ⇒n−1=(340−36)∕16 ⇒n−1=(304)∕16 ⇒n−1=19 ⇒n=20 ∴ The grasshopper will take 20 jumps to climb the wall.