Answer :
We convert between different units of mass using their conversion ratios: 1kg = 1000g, 1ton = 1,000,000g, 1quintal = 100kg. Applied to the given quantities, 250kg = 250,000g; 67ton = 67,000,000g; 25kg = 0.25quintal; 2ton = 20quintals.
To convert from kilograms to grams, we multiply by 1000 as 1 kg = 1000 g. Therefore, for A) 250 kg = 250,000 g.
To convert from tons to grams, we know 1 ton = 1,000,000 (1 million) grams, therefore, C) 67 ton = 67,000,000 g.
For a quantity already in grams or a subunit of grams (milligrams), you don't convert. Accordingly, D) 89 mg remains as it is or convert to 0.089 g if you must express it in grams.
On the other hand, a quintal is a unit of weight equaling 100 kilograms. To convert from kilograms to quintals, divide by 100. Therefore, A) 25 kg = 0.25 quintal and D) 300 kg = 3 quintals.
Finally, to convert from tons to quintals, we should know 1 ton = 10 quintals. Thus, B) 2 tons = 20 quintals. And for C) 5000 mg, since it's much lower than kg, it will be a very small decimal in quintal which can be disregarded for practical purposes.
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