In a class, 3/5th of the students are girls and 1/3rd of them travel to school by bus, 36 girls of that class do not travel to school by bus. Find the strength of the class.
Explanation:
Let the strength of the class be x.
Number of girls = 3/5 × x∙
1/3rd of the girls travel to school by bus.
∴ 2/3rd of them do not travel to school by bus.
⇒ x × 3/5 × 2/3 = 36
⇒ x = 90
Hence, 90.
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