IBPS Government Jobs Exams Numerical Ability Area and Volume

If the ratio of curved surface area of cylinder to the volume of cylinder is 2:21 while the ratio of diameter of cylinder to the height of cylinder is 7:3. Find the total surface area(sq. unit) of cylinder? (A) 5150 (B) 5148 (C) 5146 (D) 5140

Read Solution (Total 1)

(2*pi*r*h)/(pi*r*r*h)=2/21
from here we claculate r=21
now,ratio of dia and height=7:3.so,dia=2*r=21*2=42
42/h=7/3,from here,h=18.
total surface area=2*pi*r(r+h)
2*22/7*21(21+18)
132(21+18)
132*39=5148,which is required ans
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