A, B and C have Rs.600 between them, A and C together have Rs.250 and B and C Rs.450. How much does C have?  Choose the correct choice from the following: A) 70 B) 90 C) 120 D) 100 E) 140

Rationale: "a + b + c = 600 a + c = 250 b + c = 450 - - - - - - - - - - - - - - a + b + 2 c = 700 a + b + c = 600 - - - - - - - - - - - - - - - - c = 100 answer : d"
Answer: D