# Excavation

Mr. Vendelín calculated that excavation for a water connection digs for 10 days. His friend would take 10 days. Vendelín worked 3 days alone. Then his friend came to help and started on the other end.

On what day since the beginning of the excavation they met?

On what day since the beginning of the excavation they met?

### Correct answer:

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

**algebra**- equation
- system of equations
**arithmetic**- rounding
**basic functions**- ratio
- reason
- inverse relationship
- direct relationship
**numbers**- rational numbers

#### Units of physical quantities:

#### Themes, topics:

#### Grade of the word problem:

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