Postal or Sorting Assistants Model Paper 3 With Solutions

Question : 23 of 100

Marks: +1, -0

The number of coins of 1.5 cm in diameter and 0.2 an thick, to be melted to form a right circular cylinder of height 10 cm and diameter 4.5 cm is :

Solution:

(c)Required number of coins =

{π[{4.5}/2]^2×10}/{π[{1.5}/2]^2×2/10}

{45×45}/{20×20}×{10×20×20×10}/{15×15×2}=9×10×5=450

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