25kg : 20g = 50kg : 40g

1kg = 1000g

25kg = 25000g

25kg: 20g = 25000g:20g = 2500:2 = 1250:1

50kg = 50000g

50kg:40g = 50000g:40g = 5000:4 = 2000:2 = 1000:1

Hence FALSE