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If a Person A do the work in 20 days and a Person B do the work in 30 days.If both person do that work together,in how many days will they take to do that



If A person take 20 days is =X
if Bperson take 30daya is =y 
    = X +Y
    = 20+30

0 0 0
Wrong man
answer is coming 12 in my book but dont know how to do it!! ;)
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