With the 3:1 ratio, the weight of the double pulley is 25.00 kg - the weight of the single pulley is 12.50 kg.
With the 2:1 ratio, the weight of the double pulley is 37.50 kg - the weight of the single pulley is 18.75 kg.
With the 1:1 ratio, the weight of the double pulley is 75.00 kg - the weight of the single pulley is 37.50 kg.