There can be no equivalence.
A gram is a measure of mass. A millilitre is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider 100 ml of air. How many grams? Next consider 100 ml of water. How many grams?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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12 . 06 gms
200 ml X .50 = 100 ml
Two ways - which are closely related. Method 1: 1000 ml is 10 times as big as 100 ml and so will be 10 times as much. Since the first is 100 rs then the second is ten times as much, which is 1000 rs. Method 2: 100 ml for 100 rs is equivalent to 1 rs per 1 ml or 1 rs per ml. At that rate, 1000 ml will be 1000 rs.
100 mL = 0.1 L of water
1 m = 100 cm so 1 sq m = 1 m * 1 m = 100 cm * 100 cm = 10,000 sq cm. Multiply the gms/sqcm figure by 10,000 to get gms/sq metre.