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There are 40 boys (5/7 x 56) and 16 girls (2/7 x 56).
Suppose each boy received u sweets. Then each girl received 3u sweets.
Total number of sweets is 40 x u + 16 x 3u = 88u = 792. So u = 9.

Therefore each girl received 3u = 3 x 9 = 27 sweets.

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