The following table represents the number of computers (numbers in thousands) manufactured by four companies from period 2014 to 2016. Study the table carefully and answer the following question.
| Year | 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?
Answer & explanation
Correct answer: option 2
Production of A & D in 2014 to 2016 - Production of B & C in 2014 to 2016
= {(1350+570+420) + (810+990+580)} - {(750+520+1170) - (630+1280+650)}
= 4720 - 5000
= - 280
= 280 ( production is positive )