Question
Tiffany spent $18 on puffs which costs $1.80 each. For every 3 puffs bought, she received one free puff. How many puffs did she buy altogether?
3 m

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Tiffany spent $18 on puffs which costs $1.80 each. For every 3 puffs bought, she received one free puff. How many puffs did she buy altogether?