Floating floor

In the new building is considered a floating floor worker in each room. 30 minutes lay 9 m2 of the floor. How long 3 workers laid the floor in 4 rooms with a total area of 90 m2?

Result

x =  100 min

Solution:

x=30/9 90/3=100 minx=30/9 \cdot \ 90/3=100 \ \text{min}



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