A snail fell into a well that is 300 cm deep.In the first hour, it climbed 80 cm up the well.In the second hour, it climbed 70 cm up the well.Each hour, it managed to climb 10 cm less than the hour before.How many hours did it take to climb out of the well?Solution1st h --> 80 cm 2nd h --> 70 cm3rd h --> 60 cm4th h --> 50 cm5th h --> 40 cm(80 + 70 + 60 + 50 + 40) cm = 300 cm --> 5 hoursAnswer: 5 h
Friday, February 05, 2010
Ai Tong Sch 2009 P6 CA1 Math Paper 2 Q9
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