15 number

What number is smaller (greater) by 15 than its half?

Correct answer:

a =  -30
b =  30

Step-by-step explanation:

$$\begin{gathered} a+15=a\mathrm{/}2 \\ 0.5a=-15 \\ {\displaystyle \frac{1}{2}}a=-15 \\ a=-30=-30 \end{gathered}$$

$$\begin{gathered} b-15=b\mathrm{/}2 \\ 0.5b=15 \\ {\displaystyle \frac{1}{2}}b=15 \\ b=30=30 \end{gathered}$$

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