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Answer:
Step-by-step explanation:
Let the weight of each circle be x. If the weight of the triangle is double the weight of the circle, then
weight of each triangle = 2x
From the information given,
weight of rectangle = 80
number of circles = 4
weight of 4 circles = 4x
number of triangles = 4
weight of 4 triangles = 4 * 2x = 8x
Weight of triangles and circles = 4x + 8x = 12x
Since the scale is balanced,
12x = 80
x = 80/12
x = 6.67
Weight of circle = 6.67 grams