Answer:
3 grams
Explanation:
square=2g x 6=12g
cricle= 3g x 3= 9g
12+9=21 grams +2triangles
2nd chain:
cricle= 3g x 2 = 6g
square= 2g x 3=6g
6 +6=12g + 5triangles
21 + 2t = 12 + 5t
9 + 2t = 5t
9 = 3t
3=t
triangle = 3g
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