Question
Betty had 30 more seashells than Tammy at first. After Betty bought another 28 seashells, she had thrice as many seashells as Tammy. How many seashells did Betty have at first?
4 m

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Betty had 30 more seashells than Tammy at first. After Betty bought another 28 seashells, she had thrice as many seashells as Tammy. How many seashells did Betty have at first?