Billy would have of scored a total of 40 points because then you split 90 in half you get 40 50 and then 50 is 10 more than 40 and logan scored 10 more so here is your answer
Since the question is asking for surface area and the dimensions are multiplied by 10, the surface area is multiplied by 10^2, or 100. (For area it would be 10^3, or 1000)
