a simple math question, where 98% of examinees made a mistake... 

There is no need to use ambiguous and confusing mathematical notation. Scientists and engineers don’t use such a division sign-it is elementary school dogma.

15

C 15

5+ 5 :5 (10) = 5 + 1(10) = 5+ 10 = 15 (c )

15 I.

Ans.C)15

C

5 + 5 : 5(5+5)= 10 : 50 = 0,2

Ans 15

5

15

15

15

15