Question

please answer this question

Answer 1

15m=1500cm,10m=1000cm,8m=800cm

$no. \: of \: bricks = \frac{volume \: of \: wall}{volume \: of \: brick} \\ = \frac{1500 \times 1000 \times 800}{15 \times 8 \times 5} \\ = 10000 \times 200 \\ = 2000000 \: bricks$
I hope it helps you.

Answer 2

Volume of cuboid =length×breadth×height
volume of brick =(15×8×5)cm
=600 cm
Volume of wall=(15×10×8)m
=1200m
1m=100cm
1200m =( 1200×100)cm
=120000cm
No of bricks =volume of wall÷volume of bricks
=120000cm÷600cm
=20000 bricks