Concept explainers
How long would it take her apprentice to wash all the windows alone?

Answer to Problem 45PPE
11h 20 min
Explanation of Solution
Given:
Sumi can wash the windows of an office building in
Concept Used:
- Least Common Denominator (LCD) is the smallest number that is divisible by the denominator of all the fractions that are being added or subtracted.
- Solving an equation containing rational expressions
- Multiply both sides of equations by LCD(least common denominator) of all denominators.
- Remove any grouping symbols and solve the resulting equation for the variable asked in equation
Calculation:
Let it takes x minutes to her apprentice to wash all the windows alone. So, in 1 minute she will do
Then the time taken by Sumi to wash all window would be
On a particular day they worked together for 2 h 16 min = 136 min. So, they together completed
So remaining job is
This remaining part Sumi completed in 4 h 32 min = 272 minutes.
Now Sumi do in 272 min
So, in 1 min she will do
Now as per our initial assumption, Sumi’s 1 min work is
So, it will take 680 minutes or 11h 20 min to her apprentice to wash all the windows alone.
Chapter 11 Solutions
High School Math 2015 Common Core Algebra 1 Student Edition Grade 8/9
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