Question 1 — IGCSE 0580 May/June 2024 Paper 41
Cambridge IGCSE Mathematics 0580, Extended tier, calculator. Topic: Numbers · Indices. Worth 15 marks.
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Question text
1 (a) The table shows the areas, in km2, of the four largest rainforests in the world.
Rainforest Area (km2)
Amazon 5 500 000
Congo 2 000 000
Atlantic 1 315 000
Valdivian 250 000
(i) Find the area of the Valdivian rainforest as a percentage of the area of the Amazon rainforest.
..............................................% [1]
(ii) Write, in its simplest form, the ratio of the areas of the rainforests Valdivian : Atlantic : Congo.
....................... : ...................... : ...................... [2]
(iii) The Amazon rainforest has 60% of its area in Brazil and 10% of its area in Colombia.
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43 % of the remaining area of the rainforest is in Peru.
3
Find the percentage of the Amazon rainforest that is in Brazil, Colombia and Peru.
..............................................% [3]
© UCLES 2024 0580/41/M/J/24
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(iv) The area of the Amazon rainforest represents of the total area of rainforest in the world.
50
Calculate the total area of rainforest in the world.
Give your answer correct to the nearest 100 000 km2.
......................................... km2 [3]
(v) In the world, 60.7 hectares of rainforest are lost every minute.
Calculate the total area, in hectares, of rainforest that is lost in 365 days.
Give your answer in standard form.
................................... hectares [3]
(b) The Amazon river has a length of 6440 km, correct to the nearest 10 km.
The Congo river has a length of 4400 km, correct to the nearest 100km.
Calculate the upper bound of the difference between the lengths of the Amazon river and the
Congo river.
........................................... km [3]
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