this relation is a function, y=30x
for every ax or 1 gallon, it goes 30 miles.
The lcm of 6,5,and 3 is 30.
Let's first break it down to the time 8 people need for one wall. That would be 10 minutes, right? If one person would have to do it in stead of 8, you'd expect him to take 80 minutes.
To paint 7 walls, he would nee 7x80 = 560 minutes. 10 people would do that 10 times faster, ie., 56 minutes.
I know puzzles like these always have a mindtrick. Did I miss anything?? ;-)
Change in y over the change in x
-1-7=-8
1- -3=4
-8 divided by 4
Slope=-2
