A snail climbs 3 metres up a 10 metre wall by day and slips back 2 metres at night. On which day does it reach the top?
Answer and explanation
Correct answer: D. On day 8
- Step 1: The snail gains one metre per full day and night. Step 2. After 7 days it is at 7 metres, and on day 8 it climbs 3 metres to 10. Answer: day 8. Why not the others: these ignore that it does not slip back after reaching the top.
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