# Robinson 82579

Robinson Crusoe came to the island with 4 grains of corn. How many years did it take him to grow enough grain for bread if he got 10 grains from one grain on average and he needed at least 1kg of bole for 1 bread, and 1 grain weighs about 0.2g? (assume one harvest per year.)

## 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**- rounding
**basic functions**- logarithm
- exponential function

### Units of physical quantities:

### Grade of the word problem:

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