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z=12
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z≔12
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z=15-\lfloor 3+\frac{3}{4}\rfloor
Dividing 15 by 4 gives 3 and remainder 3. Rewrite \frac{15}{4} as 3+\frac{3}{4}.
z=15-3
The floor of a real number a is the largest integer number less than or equal to a. The floor of 3+\frac{3}{4} is 3.
z=12
Subtract 3 from 15 to get 12.
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