Sharon wants to buy a bike helmet that costs $21. She already has $9 saved. She plans to sell lemonade to earn enough money to buy the bike helmet. For each cup of lemonade she sells, she makes a profit of $0.20. Explain how to determine how many cups of lemonade she must sell to make enough money to buy the bike helmet.

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  1. 21 - 9 = 12

    12/0.2 = ?

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