awal_786@hotmail.com wrote:

Answer given by software looks wrong to me, according to the property that, when we have equal sides there opposite angles should be equal. and if we solve this problem it should be 30, but software gives different answer, If I really pointed out mistake of 800Score flash CAT then I deserve few kudos

or else any one can correct me

Check out the figure given below:

Attachment:

Ques3.jpg [ 12.8 KiB | Viewed 1924 times ]
Since AD = BD, opposite angles are 50 degrees each.

Sum of all angles in a triangle is 180 so leftover angle in ABD is 80 degrees.

BDC is then 100 degrees because it is a straight angle with ABD.

In triangle BDC, since BD = DC, both angles must be 40 degrees each.

Answer (B)

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