Find the length of carpet needed {ACT}

The dimensions in the floor plan, pictured above, are measured in feet.  A builder has a roll of carpet 10 feet wide.  What is the minimum length, in feet, of carpet from this roll required to completely carpet the area shown above?
A.)  67
B.)  68
C.)  69
D.)  70
E.)  71

Find the total area of the given region to be carpeted:

total area is 600 + 25 + 50
= 675 ft²

Divide the total area by the given width of the roll to find the length
675 ÷ 10  {divided total area by given width}
= 67.5 ft   {divided to find the needed length}

At least a 68 ft length is needed   {67.5 is not an answer choice and 67 is too small}

B.)  68


- Algebra House