maths, proportion

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twelve men take 6 hours to finish a piece of work. after the 12 men have worked for 1 hour, the contractor decides to call in 8 more men to complete the remaining work. how many more hours would the 20 men take to complete the remaining piece of work?

is this correct?
12 men 6 h 1 job.
12 men 5 h 5/6 job
20 men ?h 5/6 job

x/5 = 12/20
x= 3h



yes this is correct

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