SOLUTION: If Mary and Bob cleans a room in 10 hours and Mary takes 15 hours to do it alone. How long will Bob take to clean the same room. Thank you
Algebra ->
Rate-of-work-word-problems
-> SOLUTION: If Mary and Bob cleans a room in 10 hours and Mary takes 15 hours to do it alone. How long will Bob take to clean the same room. Thank you
Log On
Question 825488: If Mary and Bob cleans a room in 10 hours and Mary takes 15 hours to do it alone. How long will Bob take to clean the same room. Thank you
You can put this solution on YOUR website! ---
rates:
x = mary
y = bob
---
x + y = 1/10
x = 1/15
---
x + y = 1/10
1/15 + y = 1/10
y = 1/10 - 1/15
y = 15/150 - 10/150
y = 5/150
y = 1/30
---
answer:
time = 1/r
1/y = 30 hours
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Solve systems of linear equations up to 4-equations 4-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php
