1 triangle. Scale 1 shows that 1 triangle equals 4 circles. Since Scale 2 shows that 2 circles equal 1 square, 4 circles equal 2 squares and 1 triangle equals 2 squares. 4 squares equal 2 diamonds on Scale 3, so 2 squares equal 1 diamond. 1 triangle, then, equals 1 diamond and balances Scale 4.
Test your brain again with this balance puzzle!
