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.
Ishwar said:
5 years ago
The avg weight of 16 boys is 50.25, then the sum of wt of all 16 boys is 50.25 * 16 = 804.
The avg wt of remaining 8 boys is 45.15, then the sum of wt of all 8 boys is 45.15 * 8 = 361.2 .
Total boys in a class is 804+361.2 = 1165.2.
And the whole avg is 1165.2/(16+8) = 48.55.
The avg wt of remaining 8 boys is 45.15, then the sum of wt of all 8 boys is 45.15 * 8 = 361.2 .
Total boys in a class is 804+361.2 = 1165.2.
And the whole avg is 1165.2/(16+8) = 48.55.
(5)
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)
Samreen hadimani said:
5 months ago
50.16 * 16 = 804.00.
45.15 * 8 = 361.20.
[804.00 + 361.20] = 1165.20 kg.
16 + 8 = 24 Total boy's.
= sum/total number,
= 1165.20/24,
= 48.55kg.
45.15 * 8 = 361.20.
[804.00 + 361.20] = 1165.20 kg.
16 + 8 = 24 Total boy's.
= sum/total number,
= 1165.20/24,
= 48.55kg.
(1)
Avneet said:
9 years ago
16 Boys = 50.25 KG
8 Boys = 45.15 KG
Total boys and their weight is;
16B + 8B = (50.25 * 16) + (45.15 * 8).
24B = 1165.2.
B = 48.55.
8 Boys = 45.15 KG
Total boys and their weight is;
16B + 8B = (50.25 * 16) + (45.15 * 8).
24B = 1165.2.
B = 48.55.
(1)
Bhawani said:
9 years ago
You can also solve in this type.
16 * 50.25 + 8 * 45.15 / 24.
8 (2 * 50.25 + 45.15) / 24.
145.75 / 3.
=> 48.55
16 * 50.25 + 8 * 45.15 / 24.
8 (2 * 50.25 + 45.15) / 24.
145.75 / 3.
=> 48.55
(1)
Nitin said:
9 years ago
Can be simply done by allegation rule.
50.25 45.15
\ /
\ /
X
/ \
/ \
2 1
NOW, (X - 45.25)/(50.25 - X) = 2/1 i.e. x = 48.55.
50.25 45.15
\ /
\ /
X
/ \
/ \
2 1
NOW, (X - 45.25)/(50.25 - X) = 2/1 i.e. x = 48.55.
(1)
Rajwinder singh said:
1 decade ago
Difference between 50.25 & 45.15 is 5.1.
16*5.1 = 81.6.
81.6/24 = 3.40.
45.15+3.40 = 48.55.
16*5.1 = 81.6.
81.6/24 = 3.40.
45.15+3.40 = 48.55.
(1)
Siddhant said:
7 years ago
Sum a/16=50.35,
Sum b/8=45.15,
Sum a=50.35*16,
Sum a=804,
Sum b=45.15*8,
Sum b=361.2.
AVG=Suma+Sumb/16+8.
AVG=801+361.2/24,
AVG=48.55.
Sum b/8=45.15,
Sum a=50.35*16,
Sum a=804,
Sum b=45.15*8,
Sum b=361.2.
AVG=Suma+Sumb/16+8.
AVG=801+361.2/24,
AVG=48.55.
(1)
Shubham j said:
7 years ago
16 boys having avg. wt. of : 50.25, i.e 50.25 * 16 = 804.
8 boys having avg. wt. of : 45.15 i.e 45.15 * 8 = 361.2.
804+361.2=1165.2.
1165.2/24 = 48.55 (24 is total boys).
8 boys having avg. wt. of : 45.15 i.e 45.15 * 8 = 361.2.
804+361.2=1165.2.
1165.2/24 = 48.55 (24 is total boys).
(1)
Sree ranga said:
6 years ago
50.25 * 16 + 45.15 = x * 24,
804+361.2 = x * 24,
1165.2/24 = x,
X = 48.55.
804+361.2 = x * 24,
1165.2/24 = x,
X = 48.55.
(1)
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