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I have done that with filter capacitors. Just last week, I needed to replace a 100uf/40uf filter capacitor. The closest thing I had was a three section cap 50uf, 50uf, 50uf. I tied the two 50uf sections together and installed it. The new 50uf was a little more than the 40uf cap, but in a filter circuit it's close enough.
Is your 40,40,20 a power supply filter?
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