Some of us are a bit s....l...o....w
]]>1 kg can be directly weighed
3-1=2, (Which means putting 3kg on the left pan and 1kg on the right,
2kg of material can be got)
3 can be directly weighed,
3+1=4,
9-(3+1)=5,
9-3=6,
(9+1)-3=7,
9-1=8,
9 can be directly weighed,
9+1=10
and so on.