Anonymous Billy goes to the store and buys 5 light bulbs. Each light bulb lasts 5 months. After 20 months he had to buy a new set .
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Anonymous Billy goes to the store and buys 5 light bulbs. Each light bulb lasts 5 months. After 20 months he had to buy a new set. Why?Correct as shown. (I assume a 'set' contains 5 light bulbs.)