Question

In a school out of 500 students, 60% are boys.
If 50 boys leave the school and 50 new girls are admitted, then the new percentage of boys is .

• A. 50
• B. 52
• C. 45
• D. 54

Answer 1

The correct option is A 50

Given that,
Total number of children in a school = 500
Number of boys in the school = 60% of 500
$=\frac{60}{100}\times 500=300$
Number of girls in the school = 40% of 500
$=\frac{40}{100}\times 500=200$
Now, as given that 50 boys leave school and 50 girls are newly admitted in the school,
$\therefore$ Number of boys left = 300 - 50 = 250
$\therefore$ Number of girls left = 200 + 50 = 250
Now, total number of children in the school = 250 + 250 = 500
$\therefore$ Percentage of boys in the school
$=\frac{numberofboys}{totalnumberofchildren}\times 100$
$=\frac{250}{500}\times 100$
$=50$%