The demography of Mista Valley, a country in the northern hemi

Question

The  demography of Mista Valley, a country in the northern hemisphere is given below in terms of the different age groups in 2022. The table gives the people in different age groups as percentage of total population. The Male Female ratio in the country is 1:1, and there are 154 million people who are at most 40 years old in Mista Valley.

Age Group    Percentage   
  <20  35    20-40  42    41-60  15    61-80  5    >80  2    ( Sort ↕  the table by clicking on the headers) 
 From each drop down menu, select the option that creates the most accurate statement based on the graph and information above.

The total number of the people above 80 years in Mista Valley is   GRAPH_1_PLACEHOLDER   million   , out of which   GRAPH_2_PLACEHOLDER   million are female.

chetan2u · Accepted Answer

At most 40 years old

It will include all the groups  \leq 40 years, so less than 20 and 20-40 year groups.
The % of total in these two groups = 35+42 = 77, meaning 77% of total = 154 million.
 0.77T = 154.......T = \frac{15400}{77} =200   million

Thus, Total population  = 200 million

(1) >80 years

2% of T = 2% of 200 = 4 million

(2) Females >80 years

We know the overall M:F = 1:1, but does it mean that the ratio is constant in each group..NO
So, cannot be determined

Edoua · Answer

4, 
2

154million people represent 42+35 percent =77 percent

The total population 100% is 200 millions people

Above 80 years represent 2% of 200 million = 4 million

The ratio male/femal is 1:1

2 million male and 2 million female

Posted from my mobile device

NisB · Answer

how are you getting 2 for female, the male to female ratio is 1:1 but there could be more female in younger bracket or more in older bracket?

Gemmie · Answer

The total number of the people above 80 years in Mista Valley is   million , out of which   million are female.

154 million people who are at most 40 years old = 35% + 42% = 77%

=> Total number =  154 \div 77 % = 200

=> Number of people above 80 years old = 200 * 2% = 4 (million)

The Male Female ratio in the country is 1:1 but we do not know the gender ratio in the above-80-year-old group

bumpbot · Answer

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The demography of Mista Valley, a country in the northern hemi

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The demography of Mista Valley, a country in the northern hemi

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