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:
139 comments Page 6 of 14.
Lily said:
2 years ago
Let,
The no of students = 100
Now, 20% of 100 =20
Above 8 years old are = 48
And 8 years old are :
2/3 of 48
= 32.
Now, the total no of students are: 48 + 32 + 20 = 100.
The no of students = 100
Now, 20% of 100 =20
Above 8 years old are = 48
And 8 years old are :
2/3 of 48
= 32.
Now, the total no of students are: 48 + 32 + 20 = 100.
(78)
Liyakat said:
9 years ago
8 years old students are exact no = 48.
Above 8 years old students are=2/3 * 48 = 32.
8years students+above 8year students = 80.
20% no of below 8 years students = 20/100 * 80 = 96.
Above 8 years old students are=2/3 * 48 = 32.
8years students+above 8year students = 80.
20% no of below 8 years students = 20/100 * 80 = 96.
Abhijit mane said:
1 decade ago
Total = x.
Below 8 years = 20/100 * x .
= 2/10x.
Above 8 years = 2/3 * 48.
= 32.
Total = 2/10x + 32 + 48 = x.
x = 100.
Below 8 years = 20/100 * x .
= 2/10x.
Above 8 years = 2/3 * 48.
= 32.
Total = 2/10x + 32 + 48 = x.
x = 100.
Akhil said:
5 years ago
Let the no.of students = x.
Total students = below 8 + exact 8 + above 8.
X = (20/100) + 48 + 2/3(48),
X = 20x/100 + 48 + 32,
X - 20x/100 = 80,
80x/100 = 80,
X = 100.
Total students = below 8 + exact 8 + above 8.
X = (20/100) + 48 + 2/3(48),
X = 20x/100 + 48 + 32,
X - 20x/100 = 80,
80x/100 = 80,
X = 100.
Mallepu Naveen Kumar said:
4 years ago
>8yrs = 2/3of 48(8yrs)=> 32students.
8yrs = 48students.
<8yrs = 20%.
80% = (32+48) = 80students,
100% = ?.
Total students = 100/80*80 = 100 students.
8yrs = 48students.
<8yrs = 20%.
80% = (32+48) = 80students,
100% = ?.
Total students = 100/80*80 = 100 students.
(2)
Hemant Asthana said:
3 years ago
x is a total number of students. Then According to the question,
x = 48 + 2/3*48 + 20% of x,
x = 48 + 32 + x/5,
4x/5 = 80,
x = 100 (total number of students).
x = 48 + 2/3*48 + 20% of x,
x = 48 + 32 + x/5,
4x/5 = 80,
x = 100 (total number of students).
(16)
Sneha rodke said:
6 years ago
80 %x = 48 + 2/3 * 48.
Then why 48 is again added. It's is only said in the question that 2/3 of no of students with the age of 8 years. Can someone explain?
Then why 48 is again added. It's is only said in the question that 2/3 of no of students with the age of 8 years. Can someone explain?
Pankaj khati uk 01 said:
4 years ago
No of students above 8 years is 48*2/3 =32,
Then let the total number of students = x,
Then 20%of x is = 20* X /100 = x/5,
Than 48 +32+x/5 = x,
Than x = 100.
Then let the total number of students = x,
Then 20%of x is = 20* X /100 = x/5,
Than 48 +32+x/5 = x,
Than x = 100.
(3)
M.Lokesh said:
4 years ago
Let us assume that total number of students =100%-20%=80%.
2/3 this means 3 parts *16=48
then 2parts * 16 = 32.
Together 80%= 48 + 32.
100% = 100 students.
2/3 this means 3 parts *16=48
then 2parts * 16 = 32.
Together 80%= 48 + 32.
100% = 100 students.
(1)
RAMESH said:
2 decades ago
Below 8 years = 20
Exact 8 years = 48
Above 8 years = 2/3*48 = 32
TOTAL OF THE ABOVE =100
Exact 8 years = 48
Above 8 years = 2/3*48 = 32
TOTAL OF THE ABOVE =100
(6)
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