Question

in a CO Educational School 45% of the tortoise student are girls if there are 40 boys in the school find the number of girls in the school​

Answer 1

Answer:

There are 48 girls.

Step-by-step explanation:

The total number of students in the school can be represented as $x.$

If 45% of the students are girls, it means that (100-45=55) 55% of the students are boys.

This means that 40 students = 55% of the total students.

With this, we can easily find the number of girls by setting a proportion.

40 students - 55% percent

$x$ students - 45% percent

55/45 = 1.22222...

Therefore, the opposite operation has to be applied on the LHS of the equation.

40 x 1.22222... = 48.888888...

There cannot be .888888 of a student and you also cannot round up to 49.

Therefore, there are 48 girls.

Answer 2

Step-by-step explanation:

Assumption: Let the total number of students in the school be x.

No. of boys = 40

No.of girls = 45% of x

According to the question...

40+ 45%of x = 100% of x

Or, 40 + 9/20 x = x

Or, 40 = x - 9/20 x

Or, 40 =( 20 - 9)/20 x

Or, 40 = 11/20 x

Or, 40 × 20 /11 = x

Or, 800/11 = x

Therefore, total no. of students = 800/11

Total no.of girls = 45/100 × 800/11

= 32.7

= 33 (approx)

OR

Assumption:Let the total no. of students be x.

Percentage of girls in school = 45%

Percentage of boys in school= (100-45)%

=55%

According to the question....

55% of x = 40

Or, x= 40 × 100/55

Or,. x= 800/11

Therefore, total no. of girls = 45% of 800/11

= 45/100 × 800/11

= 360/11

= 33 (approx)