选择题
1999 AMC 8 Problem 11: Equal Cross Sums
Each of the five numbers 1, 4, 7, 10, and 13 is placed in one of the five squares of a cross-shaped figure. The sum of the three numbers in the horizontal row equals the sum of the three numbers in the vertical column. What is the largest possible value of this common sum?
A.
20
B.
21
C.
22
D.
24
E.
30