40. Put the numbers from 1 to 7 in the circles so that each straight line of three numbers add up to the same total.
Solution:
Place the number 1 in the center circle. Each line will sum to 10.
Arrange the other numbers in pairs at the ends of the lines: (2, 7), (3, 6), (4, 5).
Line 1: 2 + 1 + 7 = 10
Line 2: 3 + 1 + 6 = 10
Line 3: 4 + 1 + 5 = 10
OR YOU MAY TRY THIS ANSWER ALSO ...
Place the number 4 in the center circle. Each line will sum to 12.
Arrange the other numbers in pairs at the ends of the lines: (1, 7), (2, 6), (3, 5).
Line 1: 1 + 4 + 7 = 12
Line 2: 2 + 4 + 6 = 12
Line 3: 3 + 4 + 5 = 12
Place the number 1 in the center circle. Each line will sum to 10.Arrange the other numbers in pairs at the ends of the lines: (2, 7), (3, 6), (4, 5).
Line 1: 2 + 1 + 7 = 10
Line 2: 3 + 1 + 6 = 10
Line 3: 4 + 1 + 5 = 10
OR YOU MAY TRY THIS ANSWER ALSO ...
Place the number 4 in the center circle. Each line will sum to 12.
Arrange the other numbers in pairs at the ends of the lines: (1, 7), (2, 6), (3, 5).
Line 1: 1 + 4 + 7 = 12
Line 2: 2 + 4 + 6 = 12
Line 3: 3 + 4 + 5 = 12
