Concept:Two independent sums are divided separately, giving only one relation between the two unknown shares, so the value of B cannot be uniquely found.Explanation:Let the first sum be divided among A,B,C in the ratio 3:4:5.So, A=3x, B=4x, C=5x.Let the second sum be divided equally between E and F.So, E=F=y.It is given that F got ₹ 1,050 less than A.Therefore, y=3x−1050.This gives only one equation with two unknowns x and y.The total amount of either sum is not given.Hence, the value of x cannot be determined.So, B=4x cannot be found.Answer:D. Cannot be determined