Civil Service Exam Reviewer · Basic Operations · hard

Evaluate: 57 × 54 ÷ 55

1. 11,920,928,955,078,124
2. 152,587,890,625
3. 15,625
4. 78,125

Answer

C. 15,625

Solution

Same base: add exponents when multiplying, subtract when dividing: 5(7 + 4 − 5) = 56 = 15,625.

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