An insect fell down into a 20 m deep well. Every day during day time he climbs up 5m and he slipped down 4m in night time. How many days will he take to come out of the well? [3 MARKS]

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Solution

Concept: 1 Mark
Application: 2 Marks

Insect climbs up 5m during day time and slips down 4m during night time

Insect will come up 1m (5m - 4m) in a day.

In 15 days insect climbs up 15m.

On 16 th day insect climb up by 15 + 5 = 20m.
Hence insect will take 16 days to climb the well.

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An insect fell down into a 20 m deep well. Every day during day time he climbs up 5m and he slipped down 4m in night time. How many days will he take to come out of the well? [3 MARKS]

Concept: 1 Mark Application: 2 Marks Insect climbs up 5m during day time and slips down 4m during night time Insect will come up 1m (5m - 4m) in a day. In 15 days insect climbs up 15m. On 16 th day insect climb up by 15 + 5 = 20m. Hence insect will take 16 days to climb the well.

Concept: 1 Mark
Application: 2 Marks

Insect climbs up 5m during day time and slips down 4m during night time

Insect will come up 1m (5m - 4m) in a day.

In 15 days insect climbs up 15m.

On 16 th day insect climb up by 15 + 5 = 20m.
Hence insect will take 16 days to climb the well.