In a diagnostic test, 72 out of 90 students achieved benchmark mastery. What percentage achieved benchmark mastery?
Answer and explanation
Correct answer: D. 80%
- Step 1: Fraction = 72 / 90. Divide numerator and denominator by 18: 72÷18 / 90÷18 = 4/5. Step 2. Convert to percentage: 4/5 100% = 80%. Answer: 80%. Why not the others:* 75% is 3/4 (67.5/90); 82% is an estimation error; 85% is 76.5/90.
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