Question

There are $42$ boys and $18$ girls in a class. What is the percentage of boys in the class?

Answer 1

Hint: In the given question, we are required to calculate the percentage of the number of boys in the class. We are given the number of boys and the number of girls separately in the problem. So, we will first find out the total number of students in the class by adding the number of boys and girls. Then, we will find the percentage of boys using the formula: $\dfrac{{{\text{Number of boys}}}}{{{\text{Total number of students}}}} \times 100\% $.

Complete step-by-step solution:
In this specific question, we are provided with the number of boys and girls.
So, the number of boys in the class is $42$. Number of girls in the class is $18$.
So, the total number of students in the class can be calculated by adding the number of boys and girls together.
So, the total number of students $ = 42 + 18 = 60$.
Now, we can find the percentage of boys in the class using the formula of percentage as $\dfrac{{{\text{Number of boys}}}}{{{\text{Total number of students}}}} \times 100\% $.
Substituting the values of the number of boys and total number of students, we get,
Percentage of boys $ = \dfrac{{{\text{42}}}}{{60}} \times 100\% $
Cancelling the common factors in numerator and denominator, we get,
$ = 7 \times 10\% $
Simplifying the calculations, we get,
$ = 70\% $
Hence, the percentage of boys in the class is $70\% $.

Note: There are various methods to find an answer to the given question, but the method described above is the simplest one. We can also consider solving the problem using the unitary method by taking the total number of students as $100\% $ and then computing the percentage of boys in the class. Work as many problems as possible to crack these types of problems in a limited time period.