Discussion
4211.01 + 22.261 - ? = 2645.759
Answer: A
The unknown is being subtracted, so it equals everything on the left minus the result on the right.
\[ 4211.01 + 22.261 - x = 2645.759 \]
\[ x = 4211.01 + 22.261 - 2645.759 \]
\[ 4211.010 + 22.261 = 4233.271 \]
\[ 4233.271 - 2645.759 = 1587.512 \]
The three near-identical distractors differ only in the last three digits, so the subtraction has to be carried out to full precision rather than estimated.
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