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Manu, Manju and Maya can do a work in 90, 30 and 45 days respectively. If they work together, in how many days will they complete work?

15 days
10 days
20 days
25 days
Explanation:
manu,manju and maya work 1/30
manju 1/30
maya 1/45
Manu,manju and maya
Total:
1/30+1/30+1/45= 1+2+3/30= 6/15+6=1/15
:: the answer is 15 days
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