Question

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

Answer 1

• B. 3/7 + 3r = 1

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