Write a word problem that can be solved by working backward. Include at least two steps in the problem. Then, show the answer and how the problem can be solved by working backward.
Molly went to the beach and collected a bag of seashells. She kept half of her collection. She gave the other half to Beth and Jack. Jack received three times as many seashells as Beth. If Beth received 8 seashells, how many seashells did Molly collect at the beach?

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