the arms of a common balance are of unequal length but the beam of the balance remains in horizontal position when the scale plates are not loaded. If w1 and w2 are the measured weight of a body when it is placed in the left and right pans respectively, the correct weight of the body is
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A physical balance has its arms of unequal length. A body weighs 18kg if kept in one pan and weighs 8kg if kept in the other pan. The true weight of the body is:
A. 13kg
B. 12kg
C. 10kg
D. 16kg
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