In the given figure, the value of x is :

All angles made by same chord on circumference are same.

So, ∠ADC = ∠ACB = 30º

In triangle ADB,

∠ADB + ∠ABD + ∠BAD = 180º

30º + Xº + 80º = 180º

Xº  = 70º

The correct answer is option (3) : 70