A and b can together complete a piece of work in 4 days. if a alone can work in 12 days, in how many days b alone complete that work
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The formula is simple. This happened to be the same formula to calculate parallel resistance of 2 resistors. Treat A and B as 2 resistors working together ( in parallel).
The parallel formula is
(AB/(A+B))=4
A=12
Solve for B, B =6
The parallel formula is
(AB/(A+B))=4
A=12
Solve for B, B =6
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