1985 AJHSME Problem 24
In a magic triangle, each of the six whole numbers is placed in one of the circles so that the sum, , of the three numbers on each side of the triangle is the same. The largest possible value for is
To maximize we must place the largest numbers a following equation:
A numeral can appear in a maximum of 2 sides in this triangle, so we can put the largest 3 numbers, 15, 14, and 13 at the corners, as shown in Figure 1.
Then, we can label the left empty circle as and the right empty circle as because 14 is one more than 13, and we need to balance it out for the sum to be the same. The bottom empty circle can be named as because We only can use the numbers and now, so and Therefore, the largest value for is
But, we have to make sure that all three sides sum to 39. The completed triangle is shown in Figure 2.