Question : The following table represents the number of computers (numbers in thousands) manufactured by four companies from the period 2014 to 2016. Study the table carefully and answer the following question.
| Years | A | B | C | D |
| 2014 | 1350 | 750 | 630 | 810 |
| 2015 | 570 | 520 | 1280 | 990 |
| 2016 | 420 | 1170 | 650 | 580 |
For the years 2014 to 2016, what is the difference (numbers in thousands) between the combined production of computers by Companies A and D and the production of computers by Companies B and C taken together?
Option 1: 460
Option 2: 280
Option 3: 370
Option 4: 310
Correct Answer: 280
Solution :
The combined production of computers by Companies A and D
= (1350 + 570 + 420) + (810 + 990 + 580) = 4720
The combined production of computers by Companies B and C
= (750 + 520 + 1170) + (630 + 1280 + 650) = 5000
$\therefore$ Required difference = (5000 – 4720) = 280
Hence, the correct answer is 280.
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