Ob is the bisector of ad and ec. eo = 2x – 20 and oc = 70 – x. solve for x.

We know that OB bisects EC where they intersect would be at point O, 
so the two lengths EO and OC must be equal. 

2x - 20 = 70 - x 

[adding x + 20 to each side] 

2x - 20 + x + 20 = 70 - x + x + 20

[simplifying]

3x = 90 

[dividing each side by 3]

x = 30 would be the answer

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