27-05-2021
Mathematics

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(Max Points) Do not answer if you’re not 100% sure. I’ll report if wrong.

Max Points Do not answer if youre not 100 sure Ill report if wrong class=

Respuesta :

mhanifa mhanifa

27-05-2021

Answer:

B. 3/7 + 3r = 1

Step-by-step explanation:

Job can be determines as:

Job = time*rate

We have:

Time 3 hours and
Rates 1/7 and r

Sum of the parts completed by both Rocco and Giulia gives the job, which is considered as a whole or 1:

1 = 3(1/7 + r)
1 = 3/7 + 3r

or

3/7 + 3r = 1

Correct choice is B

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