10 because if you take 56 divided by 9 that would equal 6.22222 so it would be 7 since you can’t have .222 shelves
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ANSWER

EXPLANATION
The given problem is

This is defined if and only if

Even the given expression can be simplified to obtain:

The exclusion is

Answer:
24 feet
Step-by-step explanation:
160/100=1,6
1% - 1,6 square feet
100-5-25-45-10=15
1,6 x 15= 24