Two workers
Two workers should fulfill specific tasks together for five days. If the first worker increased their performance twice and the second twice fell, it took them just four days. For how many days would he handle the entire task, the first worker himself?
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- algebra
- quadratic equation
- system of equations
- expression of a variable from the formula
- basic functions
- inverse proportion
Units of physical quantities:
Themes, topics:
Grade of the word problem:
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