If each edge of a cube is increased by 1

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 2D

Question:

If each edge of a cube is increased by 10%, then the percentage increase in its surface area is:

Options:

21%

19%

22%

20%

Correct Answer:

21%

Explanation:

Concept=

If the edge of a cube is increased from x to y then the percentage increase in its area will be y² - x²

So ,

+10% = \(\frac{11}{10}\)

Here x = 10 and y = 11

So, percentage increase in area = 11² - 10² = 21%