Ella gives 1/3 of the candies to her sister.
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1 - 1/3 = 2/3
Ella has 2/3 of the candies left.
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4 + 12 = 18
2/3 of the candies = 18
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Find the original number of candies:
2/3 = 18
1/3 = 18 ÷ 2 = 9
3/3 (1 whole) = 9 x 3 = 27
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Answer: There were 27 candies in the box originally.