Mensuration 2D

Quantitative Aptitude (CDS) CDS Exam

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A typist uses a paper 30 cm × 15 cm. He leaves a margin of 2.5 cm at the top and the bottom and 1.25 cm on either side. What percentage of paper area is approximately available for typing?

50%

65%

55%

60%

Explanation:

Total area = (30 × 15) cm² = 450 cm²
Area used = [(30 - 1.25 × 2) × (15 - 2.5 × 2)]
=(27.5 × 10) cm² = 275 cm²
Percentage of area used = [(275/450) × 100]% = 61.1%~60%(approx..)

By: MIRZA SADDAM HUSSAIN

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