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Answer

Before
S : G => 2 : 5

After
S : G => 3 : 8

Number of swordtails stayed the same before and after,
Before
S : G => 6 : 15

After
S : G => 6 : 16

16u-15u = 3
1u = 3

At first, total S and G = 15u + 6u = 21u = 63 ##

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