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If there were 12u sourvenirs in the shops, 6u were sold.

6u/3 = 2u magnets were sold and 4u postcards were sold.

6u/4 = 1.5u postcards were not sold and 4.5u magnets were not sold.

(a) 5 * 2u + 2 * 4u = 1224

18u = 1224

u = 68

6u = 408

408 items were sold.

(b) 4u + 1.5u = 5.5 u = 5.5 * 68 = 374

There were 374 postcards in the shop at first. 

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