MAT Exam 2022 Paper

Concept:Students below 10 years form 25%, so students of 10 years or above form 75% of the total.Explanation:Let the total number of students be $N$.Students of 10 years of age $= 75$.Students above 10 years of age $= \frac{3}{5} \times 75 = 45$.So, students of 10 years or above $= 75 + 45 = 120$.These 120 students represent $75\%$ of the school, because $25\%$ are below 10 years.Therefore, $\frac{75}{100} \times N = 120$.$\Rightarrow N = 120 \times \frac{100}{75} = 160$.Answer:Total number of students in the school is $160$, i.e. Option C.