Question

(8a2 b3 ) x (-2ab) = _____​

Answer 1

Answer:

Here l = 1.4 m = 140 cm, b = 90 cm and h = 70 cm

Volume of rectangular pit = l × b × h

= (140 × 90 × 70) cm3

= 882000 cm3

Volume of brick = 21 × 10.5 × h

Now,

Number of bricks = Volume of pit/ Volume of brick

1000 = 882000/ (21 × 10.5 × h)

h = 882000/ (21 × 10.5 × 1000)

= 4 cm