# Crystal

The crystal grows every month 1.2 permille of its mass. How many months to develop a crystal from weight 177 g to 384 g?

## Correct answer:

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

**algebra**- exponential equation
- geometric progression
**arithmetic**- exponentiation
**basic functions**- percentages
- logarithm
- per mil
- exponential function
**numbers**- real numbers

### Units of physical quantities:

### Grade of the word problem:

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