Question 1202222
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Answer: 40



Explanation:


We can draw a rectangle to represent all of the windows.
Split the rectangle in half to allocate those windows to the red robot.


The other half is then split in half to get two quarters. 
One of those quarters is allocated to the green robot.


The yellow robot gets the other quarter.


Here's what the diagram could look like
<img src = "https://i.imgur.com/wcSniLf.png">


x = number of windows total
1/4 of x = number of windows the yellow robot washed
x/4 = 10
x = 4*10
x = 40 windows total
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