equation question (1 Viewer)

[freakinout]

im having trouble with a question from the hsc of 2002 question 25) a) ii)... im ranked first in my school so if u help me ill help u ..lol... bribing works!

 

[dive246]

AE/AC = ED/CB ie. d/200 = 20/x

then cross multiple

therefore d=4000/x or dx=4000