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Source: — Problem Solving |

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by Ian Stewart » Sun Feb 10, 2013 3:35 am
The answer is 'all of the above'. For example if x=0 and y=1, then z is 60. If x=1 and y=0 then z is 30. If x and y are equal, z is 45. And if you put x and y in a 2 to 1 ratio or a 1 to 2 ratio, you'll get the other two answers. Not a good question, obviously.
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