GMAT Quantitative Reasoning Practice Test 4

A

11

=X, so A=11X. Now change A in answer A−10 with 11X to get: 11X−10. Plug in numbers in X to find out if could leave a remainder of 1 when divided by 11 . Let's try X=2 and mathrm‌A=22. In expression A−10:22−10=12.

12

11

=1 with a remainder of 1 . Try plugging the same number (2) to each of the expressions to find the right answer.