It costs ` 3300 to paint the inner curved surface of a 10 m deep well. If the cost of painting is
at the rate of ` 30 per m2, find :
(a) inner curved surface area.
(b) diameter of the well.
(c) capacity of the well.
Answers
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A.
inner CSA = total cost of painting / rate per m^2 = 3300/30 = 110 m^2 Answer
B.
inner CSA = 2πrh = 110
2r = d
πdh = 110
10πd = 110
d = 110/10π = 7/2 = 3.5 meter Answer
C.
capacity = πr^2h = 22/7 *(3.5/2)^2 *10 = 96.25 m^3 Answer
inner CSA = total cost of painting / rate per m^2 = 3300/30 = 110 m^2 Answer
B.
inner CSA = 2πrh = 110
2r = d
πdh = 110
10πd = 110
d = 110/10π = 7/2 = 3.5 meter Answer
C.
capacity = πr^2h = 22/7 *(3.5/2)^2 *10 = 96.25 m^3 Answer
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