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If 12 workers can build a wall in 9 days, how many workers are needed to build it in 6 days, working at the same rate?
(This is an inverse proportion.)

Class 8Ratios and ProportionsComparing Quantities
  • A19
  • B36
  • C18
  • D17

Step-by-Step Solution

Workers and days are inversely proportional, so workers * days is constant: 12 * 9 = 108. For 6 days: 108 / 6 = 18 workers.
Answer: C) 18

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