The average of 50 students in 10th std class is 15 years. 10 more students are admitted afresh in the class and average age is increased by 0.5 years. The average age of newly joined students is

What percentage of students does not like computer science?
Subject - No. of students
Mathematics - 6
Physics - 12
Chemistry - 15
Biology - 8
Computer Science - 9
A. 91%
B. 9%
C. 82%
D. 18%

Ans: C
Explanation:
6+12+15+8+9=50
50-9=41
(41/50)*100=82%

The average of 50 students in 10th std class is 15 years. 10 more students are admitted afresh in the class and average age is increased by 0.5 years. The average age of newly joined students is
A. 15
B. 16
C. 17
D. 18

Ans: D
Explanation:
50*15=750
50+10 * 15*0.5=60*15.5=930
930-750=180
180/10=18

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