Option 3 : 3 kg - 700 gram = 2300 gram

**Concept used:**

1 kg = 1000 gram

**Calculation:**

Option (1)

500 gram + 2 kg = 500 gram + 2000 gram = 2500 gram

∴ 2500 gram > 900 gram

Option 1 is incorrect.

Option(2)

27.57 kg = 27.57 × 1000 = 27570 gram

∴ 27570 gram ≠ 2757 gram

Option 2 is incorrect.

Option (3)

3 kg - 700 gram = 3000 gram - 700 gram = 2300 gram

∴ 2300 gram = 2300 gram

Option 3 is correct

Option 4

5 kg - 1800 gram = 5000 gram - 1800 gram = 3200 gram = 3.2 kg

∴ 3.2 kg < 4.5 kg

Option (4) is incorrect

**∴ The coeect answer is option 3**