The population of a town is 36400. 23% of the population are aged 18 and under. Work out the number of people in the town aged over 18.

1. (a)The population of a town is 36400. 23% of the population are aged 18 and under. Work out the number of people in the town aged over 18.[2]
2. (b)In a village, the ratio of the ages of the population is under 18 : 18 to 60 : over 60 = 4 : 11 : 5 . There are 890 people aged over 60. Work out the total number of people in the village aged 60 and under.[2]
3. (c)(i)In 2015, the population of a city was 702 800. In 2020, the population was 678202. Calculate the percentage decrease in the population from 2015 to 2020.[2]
4. (c)(ii)The population of the city increased by 12% between 1980 and 2015. Calculate the population of the city in 1980.[2]
5. (d)(i)The table shows the population and area of some countries. Country Population Area in km² Bangladesh 1.63 x 10⁸ 148000 Bahrain 1.54 x 10⁶ 760 Maldives 3.92 x 10⁵ 298 Lebanon 5.30 x 10⁶ 10400 Work out how many more people live in Bahrain than in Maldives. Give your answer in standard form.[1]
6. (d)(ii)The population density of a country is the number of people per square kilometre. Which of these countries has the highest population density? Show how you decide.[3]