Four cubes, each of edge 9 cm, are joined as shown below :

Write the dimensions of the cuboid obtained. Also, find total surface area and volume.

What is the maximum length of a rod which can be kept in a rectangular box with internal dimensions 32 cm x 24 cm x 8 cm.

A rectangular room is 4.5 m long, 4 m wide and 3 m high. Find the cost of white washing its walls and the roof at ₹ 15 per square metre.

The dimensions of a hall are 40 m x 25 m x 5 m. The number of persons which can be accommodated in the hall is (each person requires 5 m³ of air) :

1. 1000

2. 2000

3. 5000

4. 2500