Aptitude - Percentage - Discussion
Discussion Forum : Percentage - General Questions (Q.No. 7)
7.
In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is 
of the number of students of 8 years of age which is 48. What is the total number of students in the school?
Answer: Option
Explanation:
Let the number of students be x. Then,
Number of students above 8 years of age = (100 - 20)% of x = 80% of x.
 80% of x = 48 + |
2 | of 48 |
| 3 |
 |
80 | x = 80 |
| 100 |
x = 100.
Video Explanation: https://youtu.be/yPfocU6DA2M
Discussion:
141 comments Page 15 of 15.
Kannan said:
1 month ago
Hi, guys.
Let the total number of students be "x".
Condition 1 -> below 8 years of age = 20/100 of x = x/5 ---->1.
Condition 2 -> 8 year of age = 48 --->2.
Condition 3 -> above 8 years of age = 2/3(48) = 32 ---->3.
Then 1 + 2 + 3.
x/5 + 48 + 32 = x.
80 = x - x/5,
80 = 5x-x/5,
80 = 4x/5,
400 = 4x,
x= 400/4 =100.
Let the total number of students be "x".
Condition 1 -> below 8 years of age = 20/100 of x = x/5 ---->1.
Condition 2 -> 8 year of age = 48 --->2.
Condition 3 -> above 8 years of age = 2/3(48) = 32 ---->3.
Then 1 + 2 + 3.
x/5 + 48 + 32 = x.
80 = x - x/5,
80 = 5x-x/5,
80 = 4x/5,
400 = 4x,
x= 400/4 =100.
(15)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers