Let's do some more complicated simulations. I'll assume that MP has 40BB, and the other 2 of u have 100BB, for simplification.
3-way main pot - 120BB (40X3)
Equity Win Tie
MP2 32.57% 31.08% 1.49% { QsQc }
MP3 24.01% 21.32% 2.69% { 88+, AQs+, AKo }
CO 43.42% 40.00% 3.42% { QQ+, AKs, AKo }
Side pot - 120BB (60X2)
Equity Win Tie
MP2 40.21% 38.35% 1.86% { QsQc }
CO 59.79% 57.93% 1.86% { QQ+, AKs, AKo }
If you fold here, EV = 0
If you jam here, you are putting in 95BB more. When CO calls, You get back
0.325(120) + 0.4(120) - 95 = 39 + 48 - 95 = -8
Of course, that was with the assumption that BB was never folding vs a jam. If BB folds to a jam some small % of the time, I think your play to jam will start to become +EV here.
When CO folds vs the jam, you are effectively putting in 35bb more. Pot vs MP will have ~100BB
Equity Win Tie
MP2 59.11% 58.02% 1.09% { QsQc }
MP3 40.89% 39.80% 1.09% { 88+, AQs+, AKo }
You would get back 59% X 100BB = 59BB
Net gain = 59 - 35 = 24BB
If BB folds 25% or more of the time, you'll have a +EV jam. (I got 25% because 24 is 3 times of 8, which means that i'll have a 75/25 ratio here to breakeven)
I know the calcs are going to be pretty complicated for a beginner so feel free to ask more questions