If $9210-9124=210-\square$, the value represented by the $\square$ is
(A) 296
(B) 210
(C) 186
(D) 124
(E) 24
Solution 1

ANSWER: (E)

Evaluating the left side of the equation, we get $9210-9124=86$.

Therefore the right side of the equation, $210-\square$, must also equal 86 .

Since $210-124=86$, then the value represented by the $\square$ is 124 .

Solution 2

Since $9210-9124=(9000+210)-(9000+124)=9000-9000+210-124=210-124$, then the value represented by the $\square$ is 124 .