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g100num [7]
3 years ago
11

An electrician can wire a house in 20 hours. if she works with an apprentice, the same job can be completed in 12 hours. how lon

g would it take the apprentice, working alone, to wire the house?
Mathematics
1 answer:
AlekseyPX3 years ago
4 0
We know that
<span>An electrician can wire a house in ------------> 20 hours
so
100%----------------> 20 hours
 X-------------------> 12 hour
x=12*100/20----> x=60%

that means 
</span><span>the apprentice in 12 hours complete the (100-60)----> 40%

</span>the apprentice in 12 hours complete -------> 40%
x hours------------------------------------> 100%
x=100*12/40-----> x=30 hours

the answer is
30 hours


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