Evaluate: 3/5 + 1/2 - 1/4.
Answer and explanation
Correct answer: C. 17/20
- Step 1: Find common denominator for 5, 2, and 4, which is 20. Step 2. Convert: 12/20 + 10/20 - 5/20 = (12 + 10 - 5) / 20 = 17/20. Answer: 17/20. Why not the others: 7/20 subtracts 10; 19/20 calculates with sign error; 21/20 adds all three terms without subtraction.
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