A and do job in 20 days . They start work with together after 12 day c join and finished job in 15 day. C do whole work in how many days in
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12/20+x/8=1/15
x/8=1/15-3/5
x/7=-8/15
15x=-56
x=-56/15
x/8=1/15-3/5
x/7=-8/15
15x=-56
x=-56/15
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