Question

In a school, out of 300 students, 70% are girls and 30% are boys if 30 girls leave and no new boy is admitted, what is the percentage of girls in the school

Answer 1

Total Number if students = 300
Girls= 300×70%= 300×70/100 = 210
Boys=300-210= 90

If 39 girls leave , number of girls left will be 210-30= 180 , and Boys= 90

Percentage of girls = 180/180+90= 180/270
= 2/3 %
= 2/3×100
=66.667

Answer 2

66.667% is the percentage of girls in the school.

Step-by-step explanation:

Given:

Total Number of students = 300

Girls = 70%

Boys = 30%

Solution:

Girls = 300 $\times$70%

= $300\times \frac{70}{100}$

= 210

Boys = 300 - 210 = 90

After 30 girls leave the school,

The number of girls left will be 210-30= 180, and Boys= 90

Percentage of girls = $\frac{180}{180+90}$

                                   = $\frac{180}{270}$

                                 = $\frac{2}{3} %$

                              = $\frac{2}{3} \times 100$

                                = 66.667%