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The following graph represents the installed capacity for cement production (in tonnes) and the actual production (in tonnes) of nine cement plants of a cement company. Capacity utilization of a plant is defined as ratio of actual production of cement to installed capacity. A plant with installed capacity of at least $200$ tonnes is called a large plant and a plant with lesser capacity is called a small plant. The difference between total production of large plants and small plants, in tonnes is _______.

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Total Production of large plants as evident from the graph(those with capacity $200$ or more) is $(160+190+230+190) = 770.$

Total Production of small plants $=$ $150+160+120+100+120 = 650.$

Difference $=$ $ 770 - 650 = 120.$
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A plant with installed capacity of at least 200 tonnes is called a large plant.

 Installed capacity is greater than 200 tonnes for plant number 1, 4, 8, and 9.

 The remaining plant numbers i.e. 2, 3, 5, 6, and 7 are small plants.

Thus the difference between the total production of large plants and small plants, in tonnes is

 = (160+190+230+190) - (150+160+120+100+120)
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