C and D are two points on AB and OB respectively such that AC:AB=1:3 and OD:OB=2:5. Let OA =a and OB =b.
(a) express OC and AD in terms of a and b
(b)AD intersect CO at E such that AE:AD = 1:m and OE:OC = 1:n. Find the values of m and n
My problem is that how to set the 2 equations for (b) so that i can solve for m and n?

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Here's the diagram. It is a vector question..

Is AD a median and OC an altitude?

OD:OB = 2:5, so i don't think AD is the median

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