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15 workers build a wall in 48 hours. To finish in 30 hours you need:
A30 workers
B9 workers
C24 workers
D20 workers
Answer & Solution
Correct answer: C. 24 workers
1. Hours and workers vary inversely.
2. 48 times 15 equals 30 times y.
3. y is 24 workers.
_Source: NCERT Class 8 Mathematics, Chapter 13, Direct and Inverse Proportions._
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