Aunt Marge is giving candy to each of her nephews and nieces. She has 20 pieces of candy and she gives all the candy to the children according to her wish. If Robert gets 2 more pieces than Kate, Bill gets 6 less than Mary, Mary gets 2 more pieces than Robert, and Kate gets 2 more pieces than Bill, how many pieces of candy does Kate get?
Answers:	A) 2	B) 4	C) 6	D) 8	E) 10

Rationale: use the initial letter of each name as a variable : r = k + 2 b = m − 6 m = r + 2 k = 2 + bk = = r − 2 b = k − 2 = ( r − 2 ) − 2 = r − 4 m = r + 2 r + b + m + k = 20 r + r − 4 + r + 2 + r − 2 = 20 r = 6 k = r − 2 = 6 − 2 = 4 answer : b
Answer: B