Let total spent on costumes, be C

Then amount spent on candy is: C + 0.68

Since they spent a total of $3.18B on both items, we get: C + C + .68 = 3.18

2C + .68 = 3.18

2C = 3.18 - .68

2C = 2.5

C, or amount spent on costumes = , or   

Amount spent on candy = 1.25B + .68B, or  

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