Kate bought 7 packs of red bouncy balls and 6 packs of yellow bouncy balls. Each pack contained 18 bouncy balls. How many more red bouncy balls than yellow bouncy balls did Kate buy?
Kate bought 7 packs × 18 balls/pack = <<7*18=126>>126 red bouncy balls.
She also bought 6 packs × 18 balls/pack = <<6*18=108>>108 yellow bouncy balls.
Kate bought 126 balls - 108 balls= <<126-108=18>>18 more red bouncy balls than yellow bouncy balls.
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