Question

How can you move just one number to a different
triangle to make the sum of the numbers in each
triangle equal? (Hint: There do not have to be
exactly 3 numbers in each triangle.)

Answer 1

Answer:

Remove 9 from triangle B to A

Step-by-step explanation:

Given

Three Triangles

A: 1,2,3

B: 7,8,9

C: 4,5,6

Required

Make their sum equal

First, we need to calculate the sum in each triangles;

$A = 1 + 2 + 3$

$A = 6$

$B = 7 + 8 + 9$

$B = 24$

$C = 4 + 5 + 6$

$C = 15$

Remove 9 from triangle B to A

$A = 6 + 9$

$A = 15$

$B = 24 - 9$

$B = 15$

At this point, we have:

$A = 15$     $B = 15$     $C = 15$

Hence, the solution is to remove 9 from B to A