Question

Out of 25 children in a class, 15 are girls. What is the percentage of girls?

Answer 1

Hint: Percentage of girls are found using the formula\[\text{ }\left[ \dfrac{\text{No}\text{.of girls}}{\text{Total}\,\,\text{in class}}\text{ }\times \text{100} \right] \% \]

Complete step by step solution:
In the question, we have to find the percentage of girls in the class where out of 25 total children, 15 are girls.
So here we will use the formula for calculating the Percentage of girls\[\text{ }\left[ \dfrac{\text{No}\text{.of girls}}{\text{Total}\,\,\text{in class}}\text{ }\times \text{100} \right] \% \]
Now, it is given that there are a total of 25 children in the class so the number in the denominator of the above formula will be 25. Next, there are 15 girls, so the number in the numerator of the above formula will be 15. Now, we are just left with finding the percentage.
So the required percentage of girls in the class is:
\[\begin{align}
  & \text{ }\Rightarrow \left[ \dfrac{\text{No}\text{.of girls}}{\text{Total}\,\,\text{in class}}\text{ }\times \text{100} \right] \% \\
 & \text{ }\Rightarrow \left( \dfrac{\text{15}}{\text{25}}\text{ }\times \text{100} \right)\% \\
 & \text{ }\Rightarrow 60\, \% \\
\end{align} \]
Finally, the required answer is 60 %.

Note: Percentage will always be calculated in 100. So, use the unitary method to get the value in 100 to find the percentage. Also, avoid the common error of not dividing by 100 to get the percentage.