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?
[A].
72
[B].
80
[C].
120
[D].
150
[E].
100
Answer: Option A
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 + 2/3 of 48 ,how to came this i dont know any one can tell?
Prawin said:
(Mon, Aug 9, 2010 11:39:49 PM)
80% of x (means no of student havin age, 8 and above ) = 48(no of student of age =8)+2/3 of 48(studens abov age 8)
Ramesh said:
(Wed, Dec 8, 2010 12:37:04 AM)
Below 8 years = 20
Exact 8 years = 48
Above 8 years = 2/3*48 = 32
TOTAL OF THE ABOVE =100
Showry said:
(Fri, Jan 7, 2011 10:57:13 AM)
look this....
Total no of students
S = (age < 8) + (age = 8) + (age > 8)
age < 8 = 20%(S) ====> 20S/100
age = 8 ====> 48
age > 8 ====> (2/3)*48 ====>32
S=20S/100 + 48 +32
S=100
Rishi said:
(Sun, Jan 9, 2011 12:07:21 PM)
How 2/3 comes in abve 8 year students
Rahul said:
(Wed, May 11, 2011 04:00:50 AM)
@Ramesh
Below 8 years is 20% not 20 its not work out in all problems.
Sravanreddypailla said:
(Wed, May 11, 2011 04:09:06 AM)
Let total=x
exact 8 years = 48
above 8 years = 2/3*48 = 32
so 48+32= 80
given 20% below 8 years therefore reamaining i.e above n exact=80%
from above 80%=80
that means 20%=20(default as we take percentage in hundredths)
TOTAL OF THE ABOVE =100
Ayesha said:
(Thu, Jun 2, 2011 12:17:50 AM)
Ramesh method is very good I liked that.
Romita said:
(Fri, Jul 22, 2011 11:24:53 AM)
Thanks ramesh.
Saifz said:
(Thu, Jul 28, 2011 12:31:57 AM)
20% of students out of 100 % are below 8 years, so remaining is 80% = 48 which they are above 8 years or exact 8 years. lets take 80% of students =48
If 80%=40
then 100%=?
i.e 100*48/80=60
and 2/3 of 60=40
Hence total students in class form eq1 and eq2 60+40=100
Sonam said:
(Thu, Aug 25, 2011 09:49:07 AM)
I like your method; saifz.
Akanksha said:
(Fri, Sep 23, 2011 11:54:34 AM)
Ramesh method is best.
Chitra said:
(Fri, Sep 23, 2011 02:48:29 PM)
Ramesh you done good job. I reall impressed way of answering. Thanks a lot.
Bharathi said:
(Fri, Sep 30, 2011 09:27:53 AM)
Ramesh they specified 20% not only 20. So how answer will come for below 8 years is 20.
Shubham said:
(Wed, Oct 19, 2011 10:06:05 PM)
I think answer should be 120 because they asked total no of student not only students which are above 8years.
Anil Kumar said:
(Sun, Oct 30, 2011 06:10:50 PM)
Sravanreddy your explaination was good.
Dinesh said:
(Fri, Dec 2, 2011 08:15:16 PM)
Saravanareddy method is best.
Madhavi said:
(Tue, Jan 10, 2012 08:27:19 PM)
Ramesh mehod is best.
Swathi said:
(Fri, Jan 20, 2012 08:28:37 PM)
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???
of the number of students of 8 years of age which is 48. What is the total number of students in the school?
80% of x = 48 +