Two pipes
How long will the pool be filled with a double supply pipe if it takes the pool to fill the first pipe by 4 hours long and the second pipe 9 hours longer than both pipes open simultaneously?
Correct answer:
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You need to know the following knowledge to solve this word math problem:
- algebra
- quadratic equation
- equation
- expression of a variable from the formula
- arithmetic
- square root
- square (second power, quadratic)
- basic functions
- reason
Units of physical quantities:
Themes, topics:
Grade of the word problem:
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