Question

4. 'A' can do a piece of work in 20 uuju
'C' in 40 days. All of them start the work all together but
'A' leaves it after 5 days and 'C' before 10 days of
completion. Then 'B' completes the work. Find the total
time taken.
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Answer 1

45 is the ans is it right than say me okay