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Question

The left pan of a weighing balance has two weights of 500 g each, while the right pan has a bag of sugar and a weight of 100 g. If the pans are balanced, then the bag of sugar weighs  ___.


Your Answer
A
800 g
Your Answer
B
500 g
Correct Answer
C
900 g
Your Answer
D
1000 g

Solution

The correct option is C 900 g
Total weight on the left pan
   = 500 g + 500 g
   = 1000 g

Total weight on the right pan
   = Weight of the bag of sugar + 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 = 1000 g.
Since 900 g + 100 g = 1000 g, the bag of sugar weighs 900 g.

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