When the material is mixed and the it contains the right amount of water a

When the material is mixed and the it contains the

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When the material is mixed and the it contains the right amount of water, a mould is placed over the mixture which moulds the mixture into bricks. One mixture makes a 1000 bricks. When the mould is removed, it has to be done very cautiously, to prevent the blocks from cracking. After the blocks stayed on the production plate for 3 hours, it can be removed and placed in the warehouse for curing (after treatment of cement). Curing is the process where the moist content and the temperature of the bricks are regulated, to ensure hydration so that the cement reacheds its optimum level of strength. This process takes 4 hours. It takes place in a special brick building, which contains the necessary equipment. There is 1 invigilator (Sam) who is always in the building and who ensures that the correct temperature and moist content is maintained. Due to the high risk that the bricks can crack if the temperature or the moisture is not correct, Jan employed Sam as a permanent invigilator who earns R3 000 per month. In this way Jan can ensure that a knowledgeable person is always on service. One mixture uses 100kg of sand, 30kg of rock and 200 kg of cement. Currently Jan buys al the materials in big measure once a month. He has one silo which can store only 250kg of cement.
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The sand and rock is stored in a warehouse with the capacity to house a total of 400kg of sand and 200kg of rock. Jan’s business is of such a nature that he sometimes receives very little orders for bricks and then his cement goes bad, resulting in him having to throw it away. Other times he receives so many orders that he needs to refill the silo 5 to 6 times a month. This
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