A snail is trying to climb out of a pit that is 6 meters deep. It climbs 40 cm during the day but slips back 20 cm every night. On which day will the snail come out of the pit?
(a) 28
(b) 29
(c) 30
(d) 31
Explanation
Net gain per day (except the last day) = 40 cm – 20 cm = 20 cm
The snail climbs 40 cm on the last day and doesn't slip back.
So, we exclude the last 40 cm from the total depth:
Effective depth to cover before the final day = 600 cm – 40 cm = 560 cm
Days needed to climb 560 cm at 20 cm per day = 560 ÷ 20 = 28 days
On the 29th day, the snail climbs the last 40 cm and gets out.
Hence, option b is correct.
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