how to work out percentage of something which adds to 80%

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I have a problem I can't workout.

I have 3 work streams

maintenance optimisation innovation

I know I'm going to spend $20\%$ of my time on maintenance but don't have any specifics line items I know I will spend $4$ units of time work on optimisation and $2$ units work on innovation.

Is there a way to work out what percentage of work I will do on Optimisation and Innovation?

to clarify M + O + I = 100% M = 20%

so O + I = 80% O=? and I =?