rll33xb99t的部落格

標題:

Math數學問題(中1)

發問:

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.

最佳解答:

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.

其他解答:

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|||||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.|||||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|||||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

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