# An iron rod

If 22.5 meters of a uniform iron rod weighs 85.5 kg, what will the length of 22.8 kilograms of the same rod?

## Correct answer:

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### You need to know the following knowledge to solve this word math problem:

**algebra**- expression of a variable from the formula
**basic functions**- inverse proportion
- direct proportionality

### Units of physical quantities:

### Grade of the word problem:

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