Volume of cuboid = l × b × h = 11 × 10 × 7
Diameter of coin = 1.75 cm
Radius = \(\frac{1.75}2\) cm = 0.875 cm
Thickness of coin = 2 mm = 0.2 cm
Volume of coin (cylinder) = πr2h
= (\(\frac{22}7\)) × 0.875 × 0.875 × 0.2 cm3
Let number of coins be n
⇒ n × volume of coins = volume of cuboid
⇒ n × (22/7) × 0.875 × 0.875 × 0.2 = 11 × 10 × 7
⇒ n = \(\frac{{11} \times{10} \times{7} \times{7}}{{22} \times{0.875} \times{0.875} \times{0.2}}\)
⇒ n = 1600
