If eight gardeners can finish a landscaping job in 18 hours, then the rate at which the gardeners work is 18 hours / 8 gardeners = <<18/8=2.25>>2.25 hours per gardener.
Therefore, if there are 12 gardeners working on the same landscaping job, it will take them 12 gardeners * 2.25 hours per gardener = <<12*2.25=27>>27 hours to finish the job.
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ANSWER:
If eight gardeners can finish a landscaping job in 18 hours, then the rate at which the gardeners work is 18 hours / 8 gardeners = <<18/8=2.25>>2.25 hours per gardener.
Therefore, if there are 12 gardeners working on the same landscaping job, it will take them 12 gardeners * 2.25 hours per gardener = <<12*2.25=27>>27 hours to finish the job.
27 hours to finish the job
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