As&a level Cambridge International Thinking Skills 694/12 Paper Oct/Nov 2020

 (c) 
What percentage of those who did 
not vote would have had to have voted against 
independence, in order to ensure that as many voted in favour as voted against? 
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11
9694/12/O/N/20
© UCLES 2020
[Turn over
10 The clear waters between Scylla and Charybdis have not been charted, but the depth has been 
measured 10 m from each bank. In both cases it was 6 m. The river is 60 m across. 
 
Little sea monsters live in the river. Penelope knows that any two sea monsters could see each 
other, wherever they are in the water. 
(a) (i) What is the maximum possible depth 5 m from one of the banks?
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(ii) 
What is the maximum possible depth 20 m from the same bank?
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(iii) Why can it not be both of these at the same time?
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