2/5 of a school are boys. when 1/5 of the boys are absent 160 boys are present. How many girls are in the school?
1/5 boys absent means 4/5 present
4/5 boys = 160 = 4*40
So, there are 5*40 = 200 boys
2/5 of the students are boys
200 = 2/5 * 500
So, there are 500 students in all.
Now you can see how many are girls.
I want you help me this question is so very tough to me it says a school has 900 pupils if there are 200 boys ,how many more boys are in school
To find the number of girls in the school, we'll first determine the number of boys present.
We know that 2/5 of the school are boys. Let's assume the total number of students in the school is represented by "x". Therefore, the number of boys is 2/5 * x.
Next, we're given that 1/5 of the boys are absent, and 160 boys are present. This means that 4/5 of the boys are present, which is equal to 160 boys.
Let's use this information to calculate the total number of boys in the school.
4/5 * (2/5 * x) = 160
Let's solve for x by simplifying the equation:
(4/5) * (2/5) * x = 160
Multiplying the fractions gives us:
(8/25) * x = 160
To isolate x, let's multiply both sides of the equation by the reciprocal of (8/25), which is (25/8):
(25/8) * (8/25) * x = (25/8) * 160
Simplifying:
x = 500
So, the total number of students in the school, which includes both boys and girls, is 500.
To find the number of girls, we subtract the number of boys from the total number of students:
500 - (2/5 * 500) = 500 - 200 = 300
Therefore, there are 300 girls in the school.