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2 years, 4 months ago
2 years, 4 months ago
Let the Area of the wall to be painted be LCM of 21 and 12 which is 84.
SO total area to be paint is 84.
Now Brazen can paint it in 12 hours its means in 1 hour Brazen will paint 84/12=7 sq unit of the wall.
Similarly Ballari will paint 84/21=4 sq unit of the area in 1 hour.
Now total area is 84.
Now if Brazen starts first .Then it will take 84/(7+4) hours + some hrs
for first 14 hrs they will paint 11*7=77 sq unit and then in 1 more hour brazen will paint the remaining 7 unit.
So total required time=15 hours
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