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Solution method

a) Observation Figure 4 to give the data in the table: the data in the blue column is the Population of Vietnam, the data in the orange column is the Population of Thailand.

To calculate the ratio of the population of Vietnam and the population of Thailand, we divide the population of Vietnam by the population of Thailand in the same year.

b) Observe the data table in part a), compare the ratio of the population of Vietnam and the population of Thailand over the years and draw conclusions which year is the largest.

Detailed explanation

a)

In 1979:

+ The population of Vietnam is 53 million people.

+ The population of Thailand is 46 million people

The ratio of the population of Vietnam and the population of Thailand in 1979 is: \(\dfrac{{53000000}}{{46000000}} = \dfrac{{53}}{{46}}\)

Similarly, we have the following data table:

Year	1979	1989	1999	2009	2019
Vietnam population (million people)	53	sixty seven	79	eighty seven	96
Thailand’s population (millions of people)	forty six	56	62	sixty seven	70
Ratio of population of Vietnam and population of Thailand	\(\dfrac{{53}}{{46}}\)	\(\dfrac{{67}}{{56}}\)	\(\dfrac{{79}}{{62}}\)	\(\dfrac{{87}}{{67}}\)	\(\dfrac{{96}}{{70}}\)

b) In the above years, the ratio of the population of Vietnam and the population of Thailand is the largest in 2019 (\(\dfrac{{96}}{{70}} = \dfrac{{48}}{{35) }}\)).

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