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Always use LCM of days as total work units. Then calculate each person's per-day contribution.
Work Units = LCM of all days
Efficiency = Work Units / Days
Formula:
Take LCM of days. Each person's 1 day work = LCM/their days
Example:
A does in 10 days, B in 15 days. Together?
LCM=30. A=3 units/day, B=2 units/day. Together=5 units/day. Days=30/5=6