If 15 workers can build a wall in 20 days, how many workers are needed to build the same wall in 12 days?

Topic: Work and Time
Subtopic: Inverse Proportion

A20

B22

C25

D30

Explanation

Using inverse proportion (M1 * D1 = M2 * D2): 15 * 20 = M2 * 12 => 300 = 12 * M2 => M2 = 25 workers.

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