a and b works in 72 days b and c works in 120 days a and c
works in 90 days so a alone works in how many days
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Answer / arpit panwar
(a+b)+(b+c)+(c+a) = 1/72 + 1/120 + 1/90
2(a+b+c) = 1/30
a+b+c = 1/60
a = (a+b+c)-(b+c) = 1/60-1/120
= 1/120
ans = 120 days
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