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2015-04-03T04:06:27+05:30

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See diagram.

Weight supported by each of 2 left side legs = F1
Weight supported by each of 2 right side legs = F2
Balance forces in vertical direction:
    2 F1 + 2 F2 = 75 + 170 + 160 lb = 405 lb           =>      F1 + F2 = 202.5 lb

balance Moments about point A:
      2 * 170 + 3 * 160 - 6 * 2 F2 = 0   =>  F2 = 205/3  lb
              =>  F1 = 202.5 lb - 205/3  lb


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