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:
135 comments Page 12 of 14.
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.
Sheshu said:
1 decade ago
Student below 8 years-------20%
So the rest 80% =(above 8 + exact 8)
Given above 8 =2/3 of students of exact 8 (i.e)48, so
Above 8==2/3*48
=32.
So total students will be 100%(20%+80%)
=20%+(above 8+ exact 8)
=20%+(32+48)
=20%+(80)
For 80%-------80
For 100%------?
Cross multiply 100*80/80==100.
So the rest 80% =(above 8 + exact 8)
Given above 8 =2/3 of students of exact 8 (i.e)48, so
Above 8==2/3*48
=32.
So total students will be 100%(20%+80%)
=20%+(above 8+ exact 8)
=20%+(32+48)
=20%+(80)
For 80%-------80
For 100%------?
Cross multiply 100*80/80==100.
Winny said:
1 decade ago
20% +48 + ?
68, therefore 2/3* 48
=32
add
32+48+20
68, therefore 2/3* 48
=32
add
32+48+20
Johnson said:
1 decade ago
It is the language of the question that creates confusion. It is not clear whether no. of students ab0ve 8 is 48 0r students of 8 years age is 48.
Suji said:
1 decade ago
Yes my answer also 150 for this question. Swathi is correct.
Chethana said:
1 decade ago
@Ramesh you explained well thanks.
Swathi said:
1 decade ago
Y cant tis be 150??
2/3 of x=48
x=72 is students at age 8
72+48=120 can be equated with 80%
remaining 20% must be added to this.
80%=120
20%=x
x=30
hence total=120+30=150 is total number of students...is tis right???
2/3 of x=48
x=72 is students at age 8
72+48=120 can be equated with 80%
remaining 20% must be added to this.
80%=120
20%=x
x=30
hence total=120+30=150 is total number of students...is tis right???
Madhavi said:
1 decade ago
Ramesh mehod is best.
Dinesh said:
1 decade ago
Saravanareddy method is best.
Anil kumar said:
1 decade ago
Sravanreddy your explaination was good.
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