Author Topic: quick question (Read 959 times) Tweet Share

mozart · « **on:** January 07, 2008, 05:09:29 pm »

can someone plz tell me how to work this out.

1/30 + 1/v = 1/10

the original equation = 1/u + 1/v = 1/f

cara.mel · « **Reply #1 on:** January 07, 2008, 05:23:45 pm »

$\frac{1}{v} = \frac{1}{10} - \frac{1}{30}$

$\frac{1}{v} = \frac{3}{30} - \frac{1}{30}$

$\frac{1}{v} = \frac{2}{30} = \frac{1}{15}$

You can then flip both sides, so v=15

You can't flip over every part at the start because the left hand side isn't one fraction like that, if that helps. Sorry for writing out every step, I don't intend to make you look silly but sometimes when I do steps in my head people wonder where I went.

mozart · « **Reply #2 on:** January 07, 2008, 06:24:21 pm »

thanx lol nah it's ok it helps anyway

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