Question
A bookstore was having promotion for pens. For every 4 pens bought, 1 pen would be given free. Each pen costs $4. Sarah paid $16 for some pens. How many pens did she get altogether?
4 m

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A bookstore was having promotion for pens. For every 4 pens bought, 1 pen would be given free. Each pen costs $4. Sarah paid $16 for some pens. How many pens did she get altogether?