Answer:
im not downloading that put a screenshot and if i understand the question I will answer it to the fullest of my ablilty
I would say 60 cause 10% of 90 is 9 which is a difference of 81 while 10% of 60 is 6 which is a difference of 54.
2y(x3+9x-10x2-45) not much to be taken as a common factor
7.50*4=30
40*4=160
160-30=130
130\4=32.5
so each boy has left 32.5 with him