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Answer :
Let the number of boys be 7x
and the number of girls be 5x
As per the conditions given, we get
7x – 5x = 8
\(\Rightarrow\) 2x = 8
\(\Rightarrow\)x = 8 ÷ 2 = 4 (transposing 2 to RHS)
Hence we got the required number of boys = 7× 4 = 28
and the number of girls = 5 × 4 = 20
Hence, total class strength = 28 + 20 = 48