There are 278 houses in hannah's neighborhood she collected a total of $780 from her neighbors to donate to a local charity hannah received $5 on each house she went to from how many houses did hannah not collect money

First thing you want to do is figure out how many house she collected from: 780/5 = 156

Now simply subtract that answer from the total number of houses: 278-156 = 122 houses

$780 / 5 = 156
278 - 156 = 122

So Hannah did not go to 122 houses

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm