A set of four built-in bookshelves in to be constructed in a room. The floor-to-ceiling clearance is 6 ft 1 in. Each shelf is 7 in. thick. An equal space is to be left between shelves. What space should there be between each shelf and the next? ( There is no shelf against the ceiling and no shelf on the floor. ) Please do not use the rules for calculating with measurements.
A. 
in.
B. 
in.
C. 
in.
D. 
in.
E. 
in.
Answer: E
Mathematics
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A. 
B. 
C. 
D. 
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