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NCERT Exemplar Solutions Class 8 Mathematics Solutions for Rational Numbers - Exercise in Chapter 1 - Rational Numbers
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\frac{1}{6} of the class students are above average, \frac{1}{4} are average and the rest are below average. If there are 48 students in all, how many students are below average in the class?
From the question it is given that,
Number of students in the class who are above average = \frac{1}{6}
Number of students in the class who are average = \frac{1}{4}
Number of students in the class who are below average = 1 – ( \frac{1}{6} + \frac{1}{4} )
= 1 –. \frac{(2+3)}{12}
=1-\frac{5}{12}=\frac{(12-5)}{12}=\frac{7}{12} students
So, the number of students in the class = 48
Then,
Number of students below average = \frac{7}{12} × 48
= 7 × 4
= 28 students
∴The number of students in the class who are below average is 28.
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