5 masons can build a house in 135 days. How many masons will be required to build the same house in 75 days?

Answer: 9
Explanation
  • Work done = Number of masons × Number of days → 
  • 5×135=6755 times 135 = 675 mason-days.
  • To complete the work in 75 days, required masons = 
  • 675÷75=9675 div 75 = 9
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