Question

please solve it with explanation​

Answer 1

Answer:

Total student = 420

Girls = 5/7 In fraction in number 420 *5/7 = 300

Boys = 420 -300=120

Answer 2

Answer- The above question is from the chapter 'Simple Equations'.

Given question: In a school, there are 420 students. If $\frac{5}{7}$ of the students are girls, how many boys are there in the school.

Solution: Total number of students = 420

⇒ Number of boys + Number of girls = 420 --- (1)

Let number of girls be x.

According to the question, $\frac{5}{7}$ × 420 = x

$\implies x = \dfrac{5}{7} \times 420\\\\x = 5 \times 60\\x= 300$

∴ Number of girls = 300

Put the value of number of girls in equation 1, we get,

300 + Number of boys = 420

Number of boys = 420 - 300

Number of boys = 120

∴ Number of boys = 120.