question_answer

Which of the pairs of numbers in the given options should be placed at x and y, so that each row of four numbers -across, down and diagonally add up to 20?

3	7	6	4
6	x	3	7
4	6	y	3
7	3	4	6

A)  4, 6                

B)    4, 7                

C)    3, 7                

D)    3, 6