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MAT Exam 2023 Paper

Question : 86 of 200

Marks: +1, -0

Solution:

Concept:

The well is cylindrical, and plastering is done on its inner curved surface area.

Explanation:

Depth of the well,

h = 27.5

Diameter of the well =

7

m, so radius

r = \frac{7}{2}

Curved surface area of a cylinder is given by:

2\pi rh = 2 \times \frac{22}{7} \times \frac{7}{2} \times 27.5

= 22 \times 27.5 = 605 \text{ m}^2

Cost of plastering per square metre = ₹3.5.

Total cost of plastering the inner curved surface:

605 \times 3.5 = ₹2117.5

Answer:

₹2117.5, i.e. Option B.

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