Question

Find the number of coins , each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a right circular cylinder of height 8 cm and base diameter 6 cm.

Answer 1

Find the number of coins , each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a right circular cylinder of height 8 cm and base diameter 6 cm.

Step-by-step explanation:

Coins,

r=0.75cm

h=0.2cm

V=pi r²h =22/7*0.75*0.75*0.2 =2.475/7cm³ Cylinder, h=8 cm r=3cm V= 22/7*3*3*8 =1584/7 cm³

Number of coins = 1584/7*7/2.475 = 640

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