## (GBT Math 7 – CD) Solution 3 page 8 Math textbook 7 Kite episode 2

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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