a, b and c are the chances of horses a, b and c winning.
a=2b
b=2c
c=c
Since a is twice as likely to win as b, a can be expressed as 2*2c = 4c
They all add up to 100.
4c + 2c + c = 100
7c = 100
c = 100/7 = 14.2857 = 14.29%
b = 2 * 14.2857 = 28.57
a = 4c = 4*14.2857 = 57.14
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