2、 20.75 2 5 2 5 2 5 70 1 0

3、 1/4 25% 0.375 37.5% 1.2 6/5

4、 79 102

5,22-6 =16 (hours) 16*60=960 (minutes)

The least common multiple of 5 and 8 is 40,960/40 = 24 (times) 24+ 1=25 (times).

(Because the last bus leaves at the same time, add 1. )

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1、9 6 1 6 5 6 1/7 5

2、2/5 3/7 9/5 6/7

3、 492/500=98.4%

4、500/5000= 10%

5、 50 50 100%