Question : 
The following bar graph represents the number of CCTV cameras manufactured by a company over six years. Study the graph carefully and answer the question that follows:
What is the ratio of the total number of CCTV cameras manufactured in the years 2016 and 2017 to the total number of CCTV cameras manufactured in the years 2020 and 2021?
Option 1: 37 : 25
Option 2: 39 : 25
Option 3: 25 : 39
Option 4: 25 : 37
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Correct Answer: 25 : 37
Solution :
Total number of CCTV cameras manufactured in the years 2016 and 2017 = 2750 + 4750 = 7500
Total number of CCTV cameras manufactured in the years 2020 and 2021 = 5150 + 5950 = 11100
$\therefore$ The ratio of the number of CCTV cameras manufactured in the years 2016 and 2017 to the number of CCTV cameras manufactured in the years 2020 and 2021 = $\frac{7500}{11100} = \frac{25}{37} = 25:37$
Hence, the correct answer is 25 : 37.
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