Answer:
s = 15 over 2 (15/2 fraction) or 7.5
39
Divide 78 by 2 to get 39 and add in to the number
A dot plot shows results from a range of data, giving it coordiantes so you can plot it on a graph
Its a little complicated, so I cant rlly explain it on here. But yes, 2 questions can have more than one solution. Like how theres a problem in a story, but theres plenty of solutions to solve it.