1.In a school of 1500 pupils,80﹪ of the pupils travel to school by bus.If 20﹪of those who travel by bus changed to travel by MTR yesterday,find the number of students
a.who travelled by bus yesterday.
b.who did not travel by bus yesterday.
maths
2007-03-08 4:44 am
回答 (3)
2007-03-09 8:02 am
✔ 最佳答案
a)1500 x 80% x (1-20%)
=1500 x 0.8 x 0.8
=1200 x 0.8
=960
960 pupils travelled by bus yesterday.
b)
1500-960
=540
540pupils did not travel by bus yesterday
2007-03-08 4:56 am
1a.(1500*80%)(1-20%)
=960
1b.1500-960
=540
=960
1b.1500-960
=540
2007-03-08 4:49 am
a) 1500x80%x80%
=960
b) 1500-960
=540
=960
b) 1500-960
=540
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