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Working together, Rocco and Giulia can paint a room in 3 hours. It would have taken Rocco 7 hours to do the job alone. Which equation can be used to determine r, Giulia’s rate of work in parts per hour?

Respuesta :

Answer:

4/21  a room per hour

Step-by-step explanation:

Rocco :

7hours———> whole room

then

in 1h ———-> 1/7 of the whole room

then

in 3h ———-> 3/7 of the whole room

therefore

Giulia will finish 4/7 of the whole room in 3h

finally,

[tex]r=\frac{\frac{4}{7} }{3} =\frac{4}{21}[/tex]

Leofy

Answer:

B

Step-by-step explanation:

Rocco:  of the job per hour

Giulia:  of the job per hour

Together:  of the job per hour

Rocco + Giulia = Together

+  =  

+  =  

3x + 21 = 7x

      21 = 4x

       

It will take Giulia  hours to paint the room by herself.

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