Query regarding additional director appointed between the da

The AGM of X Ltd was scheduled to held on 30.06.2015. However, the AGM got adjourned till 25.07.2015 due to some unavoidable reasons. 

A meeting of the Board of Directors of the Company was held on 29.06.2015 whereby it was decided to appoint Mr. A as additional director w.ef. 01.07.2015.

An additional director holds office upto the date of next AGM.

At an adjourned AGM only the unfinished business can be transacted. 

Now will Mr. A will vacate office on 25.07.2015 or will he continue till the date of AGM to be held in the year 2016.

Please share your views.