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The attachment shows a structure. I'm supposed to calculate the forces in the members B and C. I try the following:

[tex]

\sum M _A = BL + 2CL - F \cdot {3 \over 2}L = 0

[/tex]

[tex]

\sum {F_Y = B + C - F = 0}

[/tex]

Solving for B and C from this doesn't yield the correct answer, which is B=3F/10 and C=6F/10.

Can someone explain?

[tex]

\sum M _A = BL + 2CL - F \cdot {3 \over 2}L = 0

[/tex]

[tex]

\sum {F_Y = B + C - F = 0}

[/tex]

Solving for B and C from this doesn't yield the correct answer, which is B=3F/10 and C=6F/10.

Can someone explain?