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Usually, it's capacitance - voltage. So you have 40 uF @ 60 volts, 20 uF @ 40 volts and 10 uF @ 20 volts. Yes, going higher than the specified voltage is fine. Too low and it's likely to fail.
On the other hand, those could be capacitance ranges. I've seen some replacement caps marker like that where they indicate the original values it can replace. In that case I'd try to find a schematic to be sure of the correct values to use. If you can't find a schematic, maybe split the difference and use 47uF, 33 uF and 16uF caps ?
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