Mathtips

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Solution for yesterday’s problem

5 students of average 48 leave and 5 students of average 54 join. There is no change in number of students. The increase in total weight is 30 kg. Therefore, increase in average is 30/45 = 2/3 kg. New average is 52.67 kg.

Today’s problem

In climbing a 21 metre long pole, a monkey climbs 6 metres in the first minute and slips 3 metres in the next minute. What time the monkey would take to reach the top of the pole?

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