• 10

  • 13

  • 18

  • 136


Since 39 persons can repair a road by working 5 hours in a day in 12 days. ∴ 1 persons can repair a road by working 5 hours in a day in 39 x 12 days. ∴ 1 persons can repair a road by working 1 hours in a day in 39 x 12 x 5 days. ∴ 30 persons can repair a road by working 1 hours in a day in 39 x 12 x 5 / 30 days. ∴ 30 persons can repair a road by working 6 hours in a day in 39 x 12 x 5 / 30 x 6 days. ∴ 30 persons can repair a road by working 6 hours in a day in 39 x 2 x 1 / 6 days. ∴ 30 persons can repair a road by working 6 hours in a day in 39 x 1 x 1 / 3 days. ∴ 30 persons can repair a road by working 6 hours in a day in 13 days.

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