Question

14. Find the number of bricks each measuring 25 cm x 12.5 cm x 7.5 cm, required to construct a wall
12 m long, 5 m high and 0.25 m thick, while the sand and cement mixture occupies 5% of the total
volume of the wall?
15. A closed rectangular box measuring 72 cm by 54 cm by 48 cm externally is made of wood 1.5 cm thick
() Find the capacity of the box in litres.
(ii) What is the volume of wood used in making the box?
(iii) What is the mass of the box, if the wood used weighs 0.9 g/cm?
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Answer 1

Answer:

find the number of bricks each measuring 25*12.5*7.5cm ... 0.5 thick while the cement and sand mixture occupies 1/20th of the ... Volume of the wall = 6*5*0.5 = 15 m3