Or to go from percentages to wheel weight do this.
Example. Your kart weighs or you want it to weigh 350#. Someone gives you a setup in front,left,and cross percentages. Write them down and figure the weight of each.
46% Front: 350 x.46 = 161# front
57% Left: 350 x.57 = 199.5# left
59% Cross: 350 x.59 = 206.5# cross
Find the difference between cross and left. 206.5 - 199.5 = 7
Add this difference to the front and divide by 2.
161+7 =168. 168÷2 = 84(right front)
(Front)161-84(rf) = 77(left front)
(Cross)206.5-84(rf)= 122.5(left rear)
(Total)350-84(rf)-77(Lf)-122.5(Lr)= 66.5(right rear)
Note: In this example cross weight is higher than left weight. If cross weight was lower than than left weight; you still find the difference between them,add it to the front and divide by two but, the wheel you would be finding is the LF instead of the RF. Then carry on finding the other wheels with simple subtraction. Final note: If cross and left are the same,just divide the front by 2 because both fronts weigh the same in this case.
It's really not that bad and you can do it quickly with paper, pencil,and calculator. Take Care Everybody.
P.S. Good info from Don K above. Always set each scale with a known weight instead of trying to "zero" them....