Math數學問題(中1)
2010-09-02 1:27 am
In a school, 48% of student are boys and 25% of the girls do not wear glasses.Suppose 468 girls wear glasses. Find the number of students in this school.
回答 (5)
2010-09-02 1:34 am
✔ 最佳答案
Let x be the number of students in this school ,then there are x(1 - 48%) girls , and 1 - 25% of the girls wear glasses , x(1 - 48%) * (1 - 25%) = 468x(0.52)(0.75) = 4680.39x = 468x = 1200The number of students in this school is 1200.
2010-09-02 2:01 am
Let the number of students in this school be x.
number of girls wear glasses=468(given)
=(1-25%)of the girls
=75% of the girls
number of girls in the school=468÷75%
=624
the number of students in the school=624÷(1-48%)
=1200
number of girls wear glasses=468(given)
=(1-25%)of the girls
=75% of the girls
number of girls in the school=468÷75%
=624
the number of students in the school=624÷(1-48%)
=1200
參考: me
2010-09-02 1:54 am
Let x be the number of students in this school ,
then there are x(1 - 48%) girls , and 1 - 25% of the girls wear glasses ,
x(1 - 48%) * (1 - 25%) = 468
x(0.52)(0.75) = 468
0.39x = 468
x = 1200
The number of students in this school is 1200.
then there are x(1 - 48%) girls , and 1 - 25% of the girls wear glasses ,
x(1 - 48%) * (1 - 25%) = 468
x(0.52)(0.75) = 468
0.39x = 468
x = 1200
The number of students in this school is 1200.
2010-09-02 1:38 am
the number of girls in this school:
468 / (1-25%)
=468 / 75%
=624
the number of students in this school:
624 / (1-48%)
=624 / 52%
=1200
468 / (1-25%)
=468 / 75%
=624
the number of students in this school:
624 / (1-48%)
=624 / 52%
=1200
參考: me
2010-09-02 1:36 am
75% of the girls wear glass = 468
Total number of girls = 468 / 75% = 624
52% of students are girls = 624
Total number of students = 624 / 52% = 1,200
Total number of girls = 468 / 75% = 624
52% of students are girls = 624
Total number of students = 624 / 52% = 1,200
參考: myself
收錄日期: 2021-04-21 22:15:07
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