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# rearrangement q watch

1. make d the subject of the equation:
m = (4d)/(x+4)
2. m = (4d)/(x+4)
m(x+4) = 4d
d = 0.25m(x+4)

easy.
3. (Original post by Undry1)
make d the subject of the equation:
m = (4d)/(x+4)
=> m(x + 4) = 4d

=> d = (1/4)m(x + 4)
4. bummer. sorry typed it in wrong.
y=(4d)/(d+4)
5. (Original post by Undry1)
bummer. sorry typed it in wrong.
y=(4d)/(d+4)
y(d + 4) = 4d

yd + 4y = 4d

4d - yd = 4y

d(4 - y) = 4y

d = 4y/(4 - y)
6. (Original post by Nylex)
y(d + 4) = 4d

yd + 4y = 4d

4d - yd = 4y

d(4 - y) = 4y

d = 4y/(4 - y)
thanks
7. No prob.
8. (Original post by Undry1)
bummer. sorry typed it in wrong.
y=(4d)/(d+4)
I remember first coming across one of these problems at GCSE; none of our class could do it. Once you know that you have to factorise, it's easy!

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Updated: March 17, 2004
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