Question

The ratio of boys to girls in a school is

boys : girls = 4:3

One day, 18 girls were absent from school.
This represents 5% of all the girls in the school

Calculate the total amount of students in school

Answer 1

4x+3x=7x

18 girls=5%

Total no: of girls×5/100=18

Total=100×18/5=360 girls

4x+360=7x

360=7x-4x

360=3x

x=360/3=120

4x=4×120=480

3x=3×120=360

Total no: of students=480+360=840

Answer 2

Answer:

The total number of students in the school = 840

Step-by-step explanation:

Given,

The ratio of boys and girls in a school = 4:3

18 girls represent 5% of the girls in the school.

To find,

The total number of students in the class

Solution

The ratio of boys and girls in a school = 4:3 we have

No of boys = 4x

No. of girls = 3x

Since 18 girls represent 5% of the girls in the school we have,

5% of 3x = 18

$3x X \frac{5}{100}$ = 18

$\frac{15x}{100}$ = 18

x = $\frac{18 X 100}{15}$

x = 120

No of girls in the schools = 3x = 3×120 = 360

No. of boys in the school = 4x = 4×120 = 480

No of boys + No. of girls  = 360 +480 = 840

∴ The total number of students in the school = 840

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