Question

A street lane is to be paved with bricks the length of the lane is 200 m and its breadth is 15m. Find the number of bricks required to pave the lane if each brick measures 20cm by 10cm

Answer 1

number of bricks required = length × breadth of lane / the measure of one break

= 200×15m/20×15cm

= 200×15m/2m

= 3000/2

=1500 bricks

Answer 2

Answer: 128000

Step-by-step explanation: Let total no. of bricks(22.5 cm ×10 cm) = 'n'

Area acquired by a brick = 22.5 × 10  = 225 cm² = 0.0225 m²

Area of the street lane = (length)×(breadth)

                                   =  240 × 12 m²

A/q,

            Total  area of the lane = n×(area of 1 brick)

⇒           240 ×12 =n(0.0225)

⇒                    n = (240×12×10000)/225

⇒                    n = 128000

Total no. of bricks required to pave the whole lane = 128000