Question

a metal cylinder with height 10 cm and diameter of base 70 cm is melted to make a number of small disks with radius 1 cm and thickness 0.5 cm how many such this could be made from the cylinder​

Answer 1

Number of cylinders that can be made = Volume of Big Cylinder / Volume of a small disk

=> n = πR²H / πr²h

cancel π

=> n = R² H / r² h

=> 35 × 35 × 10 / 1 × 0.5

=> 35 × 35 × 20

=> 700 × 35

=> 2450

Answer 2

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