GMAT Quantitative Reasoning Practice Test 4

$\frac{\mathit{A}}{11}=\mathit{X}$, so $\mathit{A}=11\mathit{X}$. Now change $\mathit{A}$ in answer $\mathit{A}-10$ with $11\mathit{X}$ to get: $11\mathit{X}-10$. Plug in numbers in $\mathit{X}$ to find out if could leave a remainder of 1 when divided by 11 . Let's try $\mathit{X}=2$ and $\mathrm{mathrm}\mathit{A}=22$. In expression $\mathit{A}-10:22-10=12$.$\frac{12}{11}=1$ with a remainder of 1 . Try plugging the same number (2) to each of the expressions to find the right answer.