SOLUTION: {{{ (w1/w2) = (f2-f)/)(f-f1)..solve for f }}}

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Question 279546: +++%28w1%2Fw2%29+=+%28f2-f%29%2F%29%28f-f1%29..solve+for+f+++
Found 2 solutions by richwmiller, stanbon:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
I fixed it so the error doesn't show

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
(w1/w2) = (f2-f)/(f-f1)..solve for f
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Cross-multiply:
w1(f-f1) - w2(f2-f) =0
w1f -w1f1 - w2f2+w2f = 0
(w1+w2)f = w1f1+w2f2
f = (w1f1+w2f2)/(w1+w2)
=============================
Cheers,
Stan H.