ࡱ> ]_\ Zbjbj ..>  j j 888LLL8TLFfR7R7R7EEEEEEE$yG+JbE8R76|R7R7R7EE888R7R8E8R7E88C|"FE]7JD~EE0F\DJ8J$FEJ8FE8R7R78R7R7R7R7R7EE8R7R7R7FR7R7R7R7JR7R7R7R7R7R7R7R7R7j : Lesson five: Hong Kong data challenge Teacher answer sheet Data challenge 1 Temperature range One day in July 2015, Hong Kong reached its highest temperature on record of 37C. That night, the minimum temperature was 28C. What was the difference between the hottest part of the day and the coolest? 9C. Data challenge 2 Rainfall intensity One day in May 2015, 2000 mm of rain fell every hour for ten hours. How much rain fell in those ten hours? 20,000mm How many centimetres would that be? 2000cm How many metres? 20m Data challenge 3 - Irresponsible sailors that litter the sea It is estimated that one out of every ten ships discharges (throws away into the sea) 20 plastic bottles every time in comes into Hong Kong waters. There are 2000 ships coming and going from Hong Kong harbour every week. How many ships are estimated to discharge plastic bottles into Hong Kong waters? 200 How many plastic bottles do these ships discharge in a week? 4000 How many in a year? 208,000 Data challenge 4 - Sustainable fishing The Hong Kong government wants to make sure that small fish escape fishing nets. This is to increase the number of fish in the seas around Hong Kong. They can do this by making sure that the holes in the net let the small fish through but capture the larger ones. The government has decided that the size of the small fish they would like to escape is 10cm long, 5 cm high and 5cm wide. Look at the picture (not to scale) showing a fishing net with the sizes of the holes. What is the area of each of the holes in the net? 24cm Would this net allow the small fish through? If not, how would you need to change the size of the holes to let the small fish escape? No, it would need to be 1cm larger If, in a few years time, the number of fish in Hong Kong waters hasnt increased, and the government decide to allow even bigger fish to escape. If they increase the size of escaping fish to 20cm long, 7.5 cm high and 7.5 cm wide, what difference will this make to the fishing nets? Each hole would need to be 56.25cm or larger to let these fish escape. Which data that you have been given has not been needed in your calculations to solve the problem? The length of the fish        Data challenge 5- The waste mountain grows and grows There are 2.5 million households in Hong Kong. Each household produces 10 kg of waste per week. There are also 0.5 million offices which produce 20 kg per week. 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