# Tennis balls

A can of tennis balls contains three balls per can and costs $7. How much will it cost for 36 tennis balls?

## Correct answer:

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

**arithmetic**- multiplication
- division
**basic functions**- inverse proportion
- direct proportionality
**numbers**- fractions

### Units of physical quantities:

### Grade of the word problem:

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