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An electrician charges P240 per hour for his time and P120 per hour for his assistant's time.On a certain job,the assistant worked alone for 3 hours

preparing the sets,and then the electrician and his assistant completed the job together.If the total bill for the job was P2280,how many hours did the electrician work?


The correct answer is 5 hours because 

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8 hours bc if you will multiply P120 to 3 = P360 and then subtract it from 2280 then you'll get 1920 and divide it with 240 = 8
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