25 Solution: In the given figure $\angle\text{CAD}=\angle\text{EAF}$ (Vertically opposite angels) $∴\angle\text{CAD}=30^\circ$ In $\triangle\text{ABD},$ $\angle\text{ABD}+\angle\text{BAD}+\angle\text{ADB}=180^\circ$ (Angle sum property) $⇒(\text{x}+10)^\circ+(\text{x}^\circ+30^\circ)+90^\circ=180^\circ$ $⇒2\text{x}+130^\circ=180^\circ$ $⇒2\text{x}=180^\circ−130^\circ=50^\circ$ $⇒ \text{x} = 25$ Thus, the value of x is 25.
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