Question

The right pan of a weighing balance has two weights of 250 g each, while the left pan has a bag of salt and a weight of 100 g. If the pans are balanced, then the bag of salt weighs ___ g.

• A. 100
• B. 200
• C. 300
• D. 400

Answer 1

The correct option is D 400

Total weight on the right pan
= 250 g + 250 g
= 500 g

Total weight on the right pan
= Weight of the bag of salt + 100 g

Since the pans are balanced, the weight on the right pan equals that on the left pan.
Therefore, the weight of the bag of sugar + 100 g = 500 g.
Since 400 g + 100 g = 500 g, the bag of salt weighs 400 g.