Brian

Brian divides 80 by 7. Between what two whole numbers is his answer?

Correct answer:

a =  11
b =  12

Step-by-step explanation:

$$\begin{gathered} x=80\mathrm{/}7={\displaystyle \frac{80}{7}}=11\frac{3}{7}\doteq 11.4286 \\ a\le x\le b \\ a=\lfloor x\rfloor =\lfloor 11.4286\rfloor =11 \end{gathered}$$

$b=\lceil x\rceil =\lceil 11.4286\rceil =12$

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