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Someone who knows how the weights are evaluated could say with more authority than me.  Assuming it's just straight arithmetic, no, 3 : 1 : 1 : 1 is 50% on the first line and the other 50% distributed among the remaining.  Since you can only assign a weight between 1 and 5 to a line, it may not be possible to apportion bandwidth ratios exactly.  But, for example, 50% may be close enough to your desired 60% to be good enough.

For a five-line setup, again with 60% on the first line and the other 40% distributed among the remaining, I think the closest you could get would be 5 : 1 : 1 : 1 : 1.  If you could assign a weight of '6' to the first line then the ratio would be exact.

Specifically, in the pfsense docs phoenix has pointed to, in the config of each Gateway, under "Advanced Options" you can assign a "Weight".  So to get a 60% : 20% : 20% distribution, I guess you'd weight them 3 : 1 : 1.