Question

the number of bricks of size 20 CM by 10 cm needed to Flora room of size 20 m by 16 m is
a 200
b 2000
c20000
d 20

Answer 1

$20 \times 10 = 200 \\ 20 \times 16 = 320 \\ 320 \\ \times 200 \\ 2000 \\ ans = 2000cm \: of \: bricks$