Discussion
If 560 workers can complete a project of constructing a bridge in 7 months, then how many more workers will be required to complete the same project in 5 months?
Answer: D
224 more workers are needed. The work is 560 × 7 = 3920 worker-months. In 5 months the workers needed are 3920 / 5 = 784. The extra workers are 784 - 560 = 224.
784 is the total required, not the extra, and 400 and 408 do not come from the inverse proportion.
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