Question

40. How many silver coins, 1.75 cm in diameter and of thickness 2 mm, must be melted to
form a cuboid of dimensions 5.5 cm x 10 cm X 3.5 cm?​

Answer 1

Answer:

let no. of coins= x

so

vol of coins= vol of cuboid

πr^2×2/10×x=l.b.h

22/7(1.75/2)^2×2/10×x=5.5×10×3.5

x=(55×3.5×7×4)÷(22×17.5×17.5×2)

=40 Ans