The weight of an iron bar 3.5m long is 8.3 / 4kg. A piece of 2m long was

The weight of an iron bar 3.5m long is 8.3 / 4kg. A piece of 2m long was cut off from this railroad bar. What is the mass of the remainder of the iron bar?

Let us find what the mass of a cut off piece of iron bar 2 m long is equal to if the whole bar weighs 8 3/4 kg. Let’s make a proportion.

3.5 m – 8 3/4 kg

2 m – x kg,

x = (8 3/4 * 2): 3.5;

x = 5 kg.

Let us find what is the mass of the remaining part of the iron bar, if a piece with a mass of 5 kg was cut off.

8 3/4 – 5 = 3 3/4 kg.

Answer: The weight of the remaining part of the iron bar is 3 3/4 kg.