The cost of 20 minutes of work by 10 workers is Rs 40. If both the number of workers and minutes are halved, what will be the cost of the work?
Rs 10
Total labour-minutes = 10 × 20 = 200. Rate = 40 / 200 = Rs 0.20 per labour-minute.
After halving both: new labour-minutes = 5 × 10 = 50. New cost = 50 × 0.20 = Rs 10.
Hence, Rs 10.
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