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Previous Year Question (PYQs)



A frog tries to come out of a dried well 900 cm deep. Each time it jumps up 60 cm, it slides back 30 cm. How many jumps are needed to get out?





Solution

Before the last jump it must reach 900 − 60 = 840 cm. Net gain per prior jump = 30 cm.
840/30 = 28 jumps, then one final 60-cm jump


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