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There are 750 students in a primary school, of which the number of boys is more than 30 times that of girls. How many boys and girls are there?
There are 288 girls and 462 boys
Setting: female students as X people
3 / 2 times x + X + 30 = 750
X=288
288 times 3 / 2 + 30 = 462
There are 750 students in the school. The number of female students is 1.5 times less than that of male students by 30. How many are there for male and female students
Male: (750 + 30) / (1 + 1.5) = 312
Female: 750-312 = 438
A hope primary school launched a new area activity, with 1 / 2 of the students participating. 2 / 3 of the boys and 1 / 4 of the girls in the school participated. What percentage of the boys in the school?
Let X be for boys, y for girls and Z for total students
2X / 3 + Y / 4 = Z / 2, so z = 4x / 3 + Y / 2
And X + y = Z, so 4x / 3 + Y / 2 = x + y, that is, X / 3 = Y / 2, that is, y = 2x / 3
So z = 5x / 3, so x = 3Z / 5
Boys make up three fifths of the school population
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