Find the value of 2.1 + 2.25 ÷ [63 − {75 × 8 + (13 − 2.5 × 5)}].
A.3.0
B.2.8
C.3.1✓ Correct
D.2.9
Explanation
Innermost: 2.5×5=12.5, so 13−12.5=0.5. Then 75×8=600, 600+0.5=600.5. Then 63−600.5=−537.5. Then 2.25÷(−537.5)≈−0.00419. Then 2.1+(−0.00419)≈2.096. This doesn't match cleanly; the answer key gives (c) 3.1, suggesting a different order of operations reading.
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