irrffan wrote:If an iron bar of 1 foot 10 inches long have a weight of 1/2 kg(500mg) how can i sort out:

Exact weight of:

Hmm, which

exact weight would that be? 0.5 kg or 500 mg? 0.5 kg = 500,000 mg, not 500 mg.

Using different units of weight can get confusing. As kilograms are the units of weight you use in all of your questions, we'll use kilograms.

For further calculations, we need a weight per linear unit of length. Since the bar is 22 inches long, inches is a logical choice. Divide the total weight of the bar by the total number of inches. This gives us the weight per inch.

0.5 kg / 22" = 0.022727 kg per inch

1 foot long iron bar.

12 inches * 0.022727 kg per inch = 0.27727 kg

The size of one KG (1000g) bar.

1 kg / 0.027727 kg per inch = 44 inches long

(15.3kg = Length: ???)
15.3 kg / 0.027727 kg per inch = 673.2081 inches

(12ft 6in. bar = weight:?? )
18 inches * 0.027727 kg = 0.40909 kg

George