If 18 identical machines required 40 days to complete a job, how many fewer days would have been required to the job if 6 additional machies of the same type had been used from the beginning?

If 18 identical machines required 40 days to complete a job, how many fewer days would have been required to the job if 6 additional machies of the same type had been used from the beginning? Correct Answer 10

                ১৮ টা মেশিনের লাগে = ৪০ দিন                ১ টা মেশিনের লাগে = ৪০ * ১৮ দিন(১৮+৬) বা ২৪ টা মেশিনের লাগে = ৪০ * ১৮২৪ = ৩০ দিনঅতএব, দিন কম লাগবে = ৪০ - ৩০ = ১০ দিন (উত্তর)                   
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