Question

This hanger is in balance. There are two labeled weights

of 8 grams and 20 grams. The four circles each have
The same weight. What is the weight of each circle, in
grams?

Answer 1

3g

Explanation:

We know that

20g = 8g + 4 * r

where r is the weight of a single red circle.

20g = 8g + 4 * r

12g = 4 * r

3g = r