Max and Maggie have to clean the house. It takes Max 12 hours to clean the house, while Maggie can complete the task in 4 hours. Their sister says that it will take 3 hours to complete if they work together. Explain each step in solving this equation, and determine if the sister is correct or not.
@KamiBug I have more cxx

Question

Max and Maggie have to clean the house. It takes Max 12 hours to clean the house, while Maggie can complete the task in 4 hours. Their sister says that it will take 3 hours to complete if they work together. Explain each step in solving this equation, and determine if the sister is correct or not.
@KamiBug I have more cxx

anonymous · Answer

This is the same thing you helped me with yesterday... :/ sorry :p

anonymous · Answer

I don't remember how to formulate or solve the equation..

kamibug · Answer

Make the equation with the fractions first. The numerator of 1 represents the house. 
The denominators represents how long it takes them. And the plus sign is b/c they're going to work together. 
After setting up the equation, next step is to make common denominators. :)
|dw:1419952340788:dw|

kamibug · Answer

What do you think the common denominator will be?

anonymous · Answer

16?

kamibug · Answer

You can multiply together all the denominators... 12*4*x = ?

anonymous · Answer

48x?

kamibug · Answer

Right! Now also change the numerators and you should have:|dw:1419952811861:dw|
Remember what the next step is? :)