Question

Find the number of coins of 1.5 cm diameter and 0.2 cm thickness to be melted to form a right circular cylinder of height 16 cm and diameter 6 cm

Answer 1

number of coins *volume of cylinder formed by coins = volume of cylinder
n*πr^2h=πr^2h
n*1.5/2*1.5/2*0.2=3*3*16
n=16*20*4=1280