There are different ways to work out, if you want to gain lots of muscle you would do heavy weight with low reps, to just trim your body and look fit you'd use low weight (like 5 Kilos) and just do a lot of reps.
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4/20 = 1/5
4.5 kg for 5 b
5
5 kg
Well, a kilogram weighs 2.2 pounds, so 5 kg would be something that weighs 11 pounds.