Question
What is the total cost of painting a conical flask at
the rate of Rs. 60 per square metre? Statement I : The radius and the height of the flask are 42 m and 36 m respectively Statement II: The area of the base of Flask is 462 sq. m and its height is 21 m. In each of the following questions, a question and two statements I and II are given. You have to decide whether the date given in the statements are sufficient to answer the question or not.Solution
From statement I, r = 42 m, h = 36 m, so cost of painting = 60 × πrl From II: pi × r × r= 462, so r can be calculated, h = 21 m, so I =pi ×  r ×  l, so I can also be calculated. cost of painting = 60 × πrl
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