Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 12)
12.
The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
Answer: Option
Explanation:
| Required average |
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| = 48.55 |
Discussion:
31 comments Page 1 of 4.
Sms said:
1 decade ago
Very complicated and tough problem. Difficult to solve it and need more explanation.
Shree Hema said:
1 decade ago
I cant understand. Please anyone help me ?
Jithu said:
1 decade ago
See @hema
Avg=total/no
avg_weight=total_weight/no_student
here 16 boys's avg =50.25
let us take x be total
Avg=x/no
ie,50.25=x/16
so
x=50.16*25
x=804------(1)
let take y be total
then
Avg=y/no
ie,45.15=y/8
So y= 45.15*8
y==361.20--------(2)
Total_number of students is=16+8=24
So all weight=x+y
i.e,804+361.20=1165.20
avg=total/no
therefore avg=1165.20/24
Avg=48.55
Avg=total/no
avg_weight=total_weight/no_student
here 16 boys's avg =50.25
let us take x be total
Avg=x/no
ie,50.25=x/16
so
x=50.16*25
x=804------(1)
let take y be total
then
Avg=y/no
ie,45.15=y/8
So y= 45.15*8
y==361.20--------(2)
Total_number of students is=16+8=24
So all weight=x+y
i.e,804+361.20=1165.20
avg=total/no
therefore avg=1165.20/24
Avg=48.55
Karan said:
1 decade ago
@Jitu superb explanation.
PavaN said:
1 decade ago
I you understand the concept then u can do like this also.. its easy too
16:8 = 2:1
then, (50.25x2 + 45.15x1) / (2+1) = 48.55
16:8 = 2:1
then, (50.25x2 + 45.15x1) / (2+1) = 48.55
(4)
M.V.KRISHNA/PALVONCHA said:
1 decade ago
Avg. of 16 boys= 50.25,
weight of 16 boys=(50.25*16)=804,
avg. of 8 boys= 45.15,
weight of 8 boys=(45.15*8)=361.2,
total no. boys=24,
total weight of the boys=1165.2.
avg. weight of 24 boys=(1165.2/24)
=48.55.
weight of 16 boys=(50.25*16)=804,
avg. of 8 boys= 45.15,
weight of 8 boys=(45.15*8)=361.2,
total no. boys=24,
total weight of the boys=1165.2.
avg. weight of 24 boys=(1165.2/24)
=48.55.
Madhavi said:
1 decade ago
@heema
It can also be solved sing the following formula:n1x1+n2x2/n1+n2....... n1=16,n2=8,x1=50.25 & x2=45.15
It can also be solved sing the following formula:n1x1+n2x2/n1+n2....... n1=16,n2=8,x1=50.25 & x2=45.15
Swapnil said:
1 decade ago
16 * 50.25= 804 (total wt of 16 boys)
8 * 45.15= 361.2 (total wt remaining 8 boys)
_____________________
24 = 1165.2 (total wt of all boys)
= 1165.2/24
=48.55 (Average wt of all boys)
8 * 45.15= 361.2 (total wt remaining 8 boys)
_____________________
24 = 1165.2 (total wt of all boys)
= 1165.2/24
=48.55 (Average wt of all boys)
Muneer.s said:
1 decade ago
16 boys total weight= 50.25*16= 804kg
8 boys total weight= 45.15*8= 361.2
Total weight of all boys= 804+361.2 =1165.2
Avg weight of all boys= 1165.2/24= 48.55
8 boys total weight= 45.15*8= 361.2
Total weight of all boys= 804+361.2 =1165.2
Avg weight of all boys= 1165.2/24= 48.55
Gokul Sreekumar said:
1 decade ago
A more simple way.
Instead of doing these complex multiplications you can simply take (50.25+50.25+45.15) /3 & you will get the answer.
Instead of doing these complex multiplications you can simply take (50.25+50.25+45.15) /3 & you will get the answer.
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