Nancy earns $28/4 = $<<28/4=7>>7 per hour.

Therefore, she has to work $70/$7 = <<70/7=10>>10 hours to earn $70.

# Answer

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Question:
Nancy earns $28 for working 4 hours. How many hours does she have to work to earn $70?
Answer:
Let's think step by step.

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10
Nancy earns $28 for working 4 hours. How many hours does she have to work to earn $70?
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