Answers

2016-04-05T16:05:44+08:00
10*(1/2) = 5
10*(2/5) = 4

So 1/2:2/5 turns into 5:4
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2016-04-07T17:35:21+08:00
The ratio of 1/2 to 2/5  is
       1/2 divided by 2/5  
       that is    1/2* 5/2  =    5/4     or     5:4
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