# The cost 4

The cost to tile a floor that measures 7 x 6 square feet is $ 2,100. How much will tile a floor measuring 11 x 13 square feet cost?

## Correct answer:

### 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
- simple proportion

### Units of physical quantities:

### Grade of the word problem:

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