The chang's neighbor owns a ready-mix company. the company receives an order for 12.5 cubic yards of concrete. this mixture of concrete contains sand, cement, gravel, and water. for each pound of water, there are 5.5 pounds of sand, 2 pounds of cement, and 7.5 pounds of gravel. determine how many pounds of cement must be used. assume a cubic yard of concrete weighs 4,000 pounds.

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You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).