1.  In an examination, 49% students failed in English, 36% students failed in Hindi, While 15% failed in both. If total number of passed students in 450, then how many students did appear in the examination?
A. 1800
B. 2000
C. 1100
D. 1500
E. None of the above

Answer: Option D

Explanation:

According to the formula .

Percentage of students passed in both the subjects

= [100 - (x + y - z)]%

= [100 - (49 + 36 - 15)]% = 30%


Let total number of students = N

According to the question,

 (N x 30)/100 = 450

 N = (450/30) x 100 = 1500

 Total number of students = 1500