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sophialoperx
27.07.2019 •
Spanish
Elige la conjugación correcta del pretérito. -el examen de español (ser) fácil. question 22 options: es se fue era save describe los anticuchos. question 23 options: son papas hervidas. son trozos de carne asada en un palillo. son semillas sagradas a los incas. son animales tontos. save
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Ответ:
Ответ:
Step-by-step explanation:
Each hour, Jim does 1/3 of the job if working alone.
Each hour, John does 1/5 of the job if working alone.
Let x = number of hours to do the job if they work together. So, each hour, they do 1/x of the job when they work together.
We get the equation: 1/3 + 1/5 = 1/x
Multiply the equation by the LCD, 15x: 5x + 3x = 15
8x = 15
x = 15/8 = 1 7/8 hrs
ANSWER: (C).