7. A wooden box of dimensions 8 m x 7 m x 6 m is to carry rectangular boxes of dimensions 8 cm x 7 cm x 6 cm. The maximum number of boxes that can be carried in 1 wooden box, is :

8. The volume of a wall. 5 times as high as it is broad and 8 times as long as it is high, is 12.8 m3. The breadth of the wall is :

9. Bricks are worth Rs. 750 per 1000 and their length, breadth and height 25 cm, 12.5 cm and 7.5 cm respectively. The cost of bricks requited to build a wall 200 m long, 1.8 m high and 37.5 cm thick, is :