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If there were 3u curry buns in the beginning, there were (1580 – 3u) tuna buns at first.

2/3 of curry buns were sold and thus left with 1/3 * 3u =u curry buns left and ( 1580 – 3u – 264) = ( 1316 – 3u) tuna buns left.

Given 

u = 2* ( 1316 –  3u)

7u = 2632

u = 376

1580 – 3u = 1580 – 1128 = 452

There were 452 tuna buns at first.

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