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Aptitude - Percentage - Discussion

Discussion Forum : Percentage - General Questions (Q.No. 7)
Percentage
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?

72
80
120
150
100
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:
135 comments Page 9 of 14.
M.Suresh said:   7 years ago
1/5*X+48+2/3*48 = X.
1/5*X+48+32 = X,
80 = (5X-X)/5,
80*5 = 4X,
400/4 = X,
100 = X.
VR Chowdary said:   1 decade ago
8< = 20.

8 = 48.

8>90(2/3)*48 = 32.

Total students = 20+48+32 = 100.
Chitra said:   1 decade ago
Ramesh you done good job. I reall impressed way of answering. Thanks a lot.
Moorthy said:   2 decades ago
80% of x = 48 + 2/3 of 48 ,how to came this i dont know any one can tell?
Sivagowtham said:   6 years ago
20%.

100-20 = 80% of X.
48*2/3 = 32,
48+32 = 80,
80% of X = 80.
X = 100.
Lavanya said:   8 years ago
@Ramesh.

They mentioned 20%.
Is that right to mention it as simply 20?
Rahul said:   1 decade ago
@Ramesh

Below 8 years is 20% not 20 its not work out in all problems.
Nisha said:   7 years ago
Why add 48 in 80% of x = 48 +2/3of 48?

Please explain this step.
Vennela said:   7 years ago
Why 2/3*48, it should be 2/3*100 right?

Please clear my doubt.
Suji said:   1 decade ago
Yes my answer also 150 for this question. Swathi is correct.
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