Look at the picture and find how many Yellow Triangles will balance the last scale?

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Ans is 6 yellow triangles.

1 red sq. = 1 blue circle + 1 yellow triangle

Multiply whole eq. With 2 we get;

2 red sq. = 2 blue circle + 2 yellow triangle. .... (A)

From 2nd image;

1 blue circle = 2 yellow triangles

Using this in equation (A), we get;

2 red sq. = 2 + 2 yellow triangles + 2 triangle s

2 red sq. = 6 yellow triangles.

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