Number of registered cars in four cities A–D (2017–2020) and their 2020 population (millions).

City	2017	2018	2019	2020	Population (million)
A	7500	8000	9000	9500	0.8
B	1200	1350	1400	1500	0.2
C	6000	7500	8500	10000	0.6
D	5000	6000	6600	7400	0.75

Taking all the cities together, what is the ratio of the total number of registered cars in the year 2020 with respect to 2017?

A284 : 197 ✓ Correct

B149 : 154

C142 : 79

D53 : 41

Correct answer: (A) 284 : 197

Explanation

The ratio of 2020 to 2017 registered cars is 284 to 197.

The total cars in all cities in 2017 add up to 19700.

The total in 2020 adds up to 28400.

So the required ratio is 28400 to 19700.

Dividing both terms by 100 gives 284 to 197.

This ratio does not simplify further.

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