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Otrada [13]
3 years ago
7

One person can do a certain job in twenty-one minutes, and another person can do the same job in twenty-eight minutes. How many

minutes will it take them to do the job together?
6 min
12 min
24 min
Mathematics
2 answers:
jenyasd209 [6]3 years ago
7 0
\dfrac{1}{21}+\dfrac{1}{28}=\dfrac{1}{x}\\
\dfrac{4}{84}+\dfrac{3}{84}=\dfrac{1}{x}\\
\dfrac{7}{84}=\dfrac{1}{x}\\
7x=84\\
x=12
Zigmanuir [339]3 years ago
5 0

Answer:

12 minutes

Step-by-step explanation:

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