Question

1. The length, breadth and hight of a brick are $21cm,15cm,7cm$. What is its volume? (1 mark)

2. A cube of iron is of side $8cm$. What is its volume? 1 cubic centimeter of iron weighs 8 grams. What is the weight of this cube? (2 mark)

3. A truck is loaded with sand, 4 metre long, 2 metre wide and 1 metre high. The price of 1 cubic metre of sand is 1000 rupees. What is the price of this truck load? (2 mark)

Answer 1

1. length of the rectangular block $=21cm$
Breadth of the rectangular block $=15cm$
Height of the rectangular block $=7cm$
Volume of the rectangular block $=21\times 15\times 7=2205$ $c{m}^3$
2. All sides of the cube are equal
Volume $=8\times 8\times 8=512cu.cm$
Weight of this cube $=512\times 8=4096$ gram

3. Ans: volume of sand $=4\times 2\times 1=8cu.m$
Price of this truck load $=8\times 1000=8000$ rupees