NCERT Exemplar Solutions Class 8 Mathematics Solutions for Rational Numbers - Exercise in Chapter 1 - Rational Numbers

Question 315 Rational Numbers - Exercise

1/6 of the class students are above average, ¼ are average and rest are below average. If there are 48 students in all, how many students are below average in the class?

Answer:

From the question it is given that,

Number of students in the class are above average = 1/6

Number of students in the class are average = ¼

Number of students in the class are below average = 1 – ((1/6) + (¼))

= 1 – ((2 + 3)/12)

= 1 – (5/12)

= (12 - 5)/12

= 7/12 students.

So, the number of students in the class = 48

Then,

Number of students below average = (7/12) × 48

= (7/1) × 4

= 28 students

∴The number of students in the class are below average are 28.

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Exercises

Rational Numbers - Exercise

Chapters

Rational Numbers

Data Handling

Squares and Square Roots & Cubes and Cube Roots

Linear Equations in One Variable

Understanding Quadrilaterals & Practical Geometry

Visualising Solid Shapes

Algebraic Expressions and Identities & Factorisation

Exponents and Powers

Comparing Quantities

Direct and Inverse Proportions

Mensuration

Introduction to Graphs

Playing with Numbers