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?

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Answers

2016-01-11T21:09:10+08:00
The correct answer is 5 hours because 

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2016-01-12T02:17:07+08:00
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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