Question

18. 5. A can do a piece of work in 12 days and B can do the same work in 36 days. If A started that work and worked for four days and left then B started to complete the remaining work. Then the total time takencomplete the work




I know answer but I want process

please give detailed process
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Answer 1

Answer:

Just zom for the 2nd pic.

You can use 60 units in every question like this.