solve the problem no. 4
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Step-by-step explanation:
A one day work=1/12
B one day work =1/15
(A+B) one day work=1/12+1/15
=5+4/60=9/60
(A+B) 5 day work =5*9/60=9/12=3/4
remaining work=1-3/4=1/4
A complete work =1/4/1/12=12/4=3 days
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