Problem attached not sure why the answer is E
Lets say the number of boxes is x. linda packs 3/10x. from stmt A
now from stmt 2 if pat packed y boxes then robert packs y + 10.
combining both we have
y + y + 10 = 7/10x or y = (7/10x - 10)/2
ratio of robert's to pat's is y + 10 / y. substituting it with x does not give the value. so E
the intutive way would be .. since we only have percentages and 10 is an absolute number , we cannot get the ratio as there can be different number of boxes resulting in the same percentage.