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Joaquin buys 3 packs light bulbs. Each pack contains 12 lights bulbs. After changing the bulbs in his house he has 15 light bulbs left. How many light bulbs did he have

User Alangab
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Answer:

Explanation:

3x12=36 light bulbs total

36-15=21 used light bulbs with 15 left unused

User Beaumind
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