Question
Xandra has 30 more crystals than Shiyun. How many crystals must Xandra give Shiyun so that Xandra will have 20 more crystals than Shiyun?
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Xandra has 30 more crystals than Shiyun. How many crystals must Xandra give Shiyun so that Xandra will have 20 more crystals than Shiyun?