In a plane ,4% of the seats are first class ,16% are business class and the rest are economy class .There are 240 economy class seat .If 20 economy class seat
are removed ,what percentage of the seats are first class?
中一maths
2008-10-24 12:55 am
回答 (3)
2008-10-24 1:04 am
✔ 最佳答案
The number of seats of first class = (240 / 80%) x 4 %
= 300 x 4 %
= 12
percentage of the seats of first class
= [12 / (300-20)] x 100%
= 4.29% ,cor to 3 sig. fig.
參考: me(f.4)
2008-10-24 1:31 am
[(240 / 80%) x 4 % / (300-20)] x 100%
= [300 x 4 % / (300-20)] x 100%
= [12 / (300-20)] x 100%
= 12/280 x 100%
= 3/70 x 100%
= [300 x 4 % / (300-20)] x 100%
= [12 / (300-20)] x 100%
= 12/280 x 100%
= 3/70 x 100%
2008-10-24 1:05 am
easy easy easy!
1) (100-4-16)%=80%economy class
total seat = 240/80%=300 seats
2) orignal first class seat no = 300 x 4%=12nos
3)If 20 economy class seat
are removed, total seats remain= 300-20=280 seats
4) then percentage of the seats are first class = 12/280x100%=4.286%
1) (100-4-16)%=80%economy class
total seat = 240/80%=300 seats
2) orignal first class seat no = 300 x 4%=12nos
3)If 20 economy class seat
are removed, total seats remain= 300-20=280 seats
4) then percentage of the seats are first class = 12/280x100%=4.286%
收錄日期: 2021-04-19 12:44:25
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