IGCSE MATHEMATICS 0580/43/O/N/20 Q1
1 (a) The Earth has a surface area of approximately 510100000km2.
(i) Write this surface area in standard form.
(ii) Water covers 70.8% of the Earth’s surface.
Work out the area of the Earth’s surface covered by water.
(b) The table shows the surface area of some countries and their estimated population in 2017.
(i) Find the total surface area of Brunei and the Maldives.
(ii) The ratio surface area of the Maldives : surface area of China
can be written in the form 1 : n.
Find the value of n.
(iii) Find the surface area of France as a percentage of the surface area of China.
(iv) Find the population density of the Maldives.
[Population density = population ÷ surface area]
(c) The population of the Earth in 2017 was estimated to be 7.53 × 109.
The population of the Earth in 2000 was estimated to be 6.02 × 109.
(i) Work out the percentage increase in the Earth’s estimated population from 2000 to 2017.
(ii) Assume that the population of the Earth increased exponentially by y% each year for these 17 years.
Find the value of y.