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Algebra Difficulty 1.0 Junior Find the answer Canada

Three pumpkins are weighed two at a time in all possible ways. The weights of the pairs of pumpkins are $12$ kg, $13$ kg and $15$ kg. How much does the lightest pumpkin weigh?

(A) $4$ kg (B) $5$ kg (C) $6$ kg (D) $7$ kg (E) $8$ kg

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.