F1 英數題help
2011-08-08 6:33 am
2/7of the students at a school are boys and there are 40 girls in school. how many student are thee in the school?
回答 (4)
2011-08-09 8:49 pm
✔ 最佳答案
因為2/7of the students at a school are boys所以5/7 of the students at a school are grils.Let y be the students are there in the school.
y x (1- 2/7) = 40
y x 5/7 = 40
5y = 280
y = 56
∴There are 56 students in the school.
參考: me
2011-08-09 10:23 pm
let x be the total number of students in the school.
(2/7)x=x-40
(2/7)x*7=x*7-40*7
2x=7x-280
280=7x-2x
280=5x
x=56
the total number of students in the school=56.
(2/7)x=x-40
(2/7)x*7=x*7-40*7
2x=7x-280
280=7x-2x
280=5x
x=56
the total number of students in the school=56.
參考: myself
2011-08-08 9:22 am
The total number of students in the school
=40/[1-(5/7)]
=280/5
=56
so,there are total 56 students in the school.
=40/[1-(5/7)]
=280/5
=56
so,there are total 56 students in the school.
參考: me
2011-08-08 6:51 am
Let y be the students are there in the school.
y x (1- 2/7) = 40
y x 5/7 = 40
5y = 280
y = 56
Therefore, there are 56 students in the school.
應該就這樣啦~!
y x (1- 2/7) = 40
y x 5/7 = 40
5y = 280
y = 56
Therefore, there are 56 students in the school.
應該就這樣啦~!
收錄日期: 2021-04-13 18:08:44
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