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Answer

540

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At first

Gold → 12u

Silver → 12u + 156

 

After

Gold (left 1/4) → 3u

Silver (left 1/6) → 2u + 26

 

3u + 2u + 26 = 106

5u = 80

u = 16

 

At first, there were (12u + 12u + 156) = 192 + 192 + 156 = 540 balloons

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