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1. |
Among four bags, B1 is twice the weight of B2. B3 is half of the weight of B2. B4 is 10 kg heavier to B2, but 10 kg lighter to B1. What is the weight (in kg) of B4? |
A. | 10 |
B. | 20 |
C. | 30 |
D. | 40 |
Answer» D. 40 | |