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### Theory

 1 Introduction to inverse proportion 2 Inverse proportion

### Exercises

 1 Choose the correct answer Difficulty: easy 3 2 Find out how many workers will finish the work in certain period Difficulty: easy 3 3 Calculate how days the food supply will last Difficulty: easy 4 4 Calculate how many persons will engineer require Difficulty: medium 4 5 Determine the number of days the food will last Difficulty: medium 5 6 Calculate the increase speed of the vehicle Difficulty: medium 5 7 Calculate in how many days painters will finish work Difficulty: medium 5 8 Determine in how many days the project will be completed Difficulty: medium 5 9 Calculate the number of days that animal can graze the field Difficulty: hard 5 10 Calculate the number of pipes need Difficulty: hard 5 11 Calculate the value of A Difficulty: hard 5

### Tests

 1 Traning Test Difficulty: medium 10

### Teacher manual

 1 Methodical recommendation