solid cube is cut into 27 identical cubes What is the percentage increase in the total surface...........

Quantitative Aptitude (CGL) Mensuration 3D

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solid cube is cut into 27 identical cubes. What is the percentage increase in the total surface area?

150

200

300

250

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Explanation:

Total height= 30
cm
height of cylinder=13cm
height of cone=30-18 (radius of hemisphere=height)
therefore height of cone= 12cm
C.S.A. of hemisphere:
2*22/7*5^2
=157.14 cm^2
C.S.A. of cylinder:
2*22/7*5*13
=408.571 cm^2
C.S.A of cone :
22/7*5*13
=204.28
Adding all C.S.As we get
408.57
204.28
+157.14
=769.99m^2 [Ans. =Surface area of toy]