You can't. Apple never released a firmware higher than 3.1.3 for the iPod 1G. However, If you want to upgrade to 3.1.3, all you have to do is download the firmware, (just Google ipod firmware and it should be the first link) then connect your iPod to iTunes and then hold down shift (or option if you are on a mac) and left lick on update. If that doesn't work, then try doing the same thing, but click restore.
31/40 = 31 ÷ 40 = 0.775
40,000mg1 gram = 1000mg40 grams:= 40 g * 1000mg/1g= 40000mg
It is: 31/40 = 0.775
31/40 = 31 divided by 40 = 0.775
16/40 + 15/40 = 31/40
40 percent of 31 is 12.4
31/40 = 0.775
31/40 = 77.5%.
ratio 124 to 40 = 31:10124 : 40 = 31 : 10
31/40
31 / 40 cannot be further simplified.
77.5% (31/40)*100 = 77.5%