1) Find the number of bricks measuring 25 cm in lenght, 5cm is breadth and 10cm in height for a wall 40 meters long, 75cm broad and 5 meters in height. A) 144 B) 1440 C) 120000 D) 144000 Answer: Option CExplanation:Volume of the wall $=40\times \frac{75}{100}\times 5=150 m^{3}$ Volume of 1 brick $=\frac{25}{100}\times \frac{5}{100}\times \frac{10}{100}=\frac{1}{800}m^{3}$ No of bricks required $=\frac{150}{\frac{1}{800}}=120000$
