Concept explainers
Find the time they will take together to clean the office.
Answer to Problem 20PT
They can clean the office in about 17 minutes, if they work together.
Explanation of Solution
Given:
Mark can clean his father`s office in 30 min. His younger sister Lynn can clean the office in 40 min. How long will it take the two them together to clean the office?
Concept Used:
Find the rate of work (job/minute) for Mark and Lynn and then find the combined rate of work and then use the rule
Time needed while both working together =
Calculation:
Time in minutes | Rate ( job/ minute) | Number of job | |
Mark | 30 minute | 1 job | |
Lynn | 40 minutes | 1 job |
Mark + Lynn (combined rate (job/minute) =
Time needed while both working together =
Thus, they can clean the office in about 17 minutes, if they work together.
Chapter 11 Solutions
High School Math 2015 Common Core Algebra 1 Student Edition Grade 8/9
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