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21 Feb 2019, 00:53
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
75% (02:59) correct
25%
(02:50)
wrong
based on 113
sessions
History
Date
Time
Result
Not Attempted Yet
The average of weight of three men A,B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E, whose weight is 3 kg.more than that of D, replaces A, then the average weight of B,C,D and E becomes 79 kg. The weight of A is :
A. 70 kg
B. 72 kg
C. 75 kg
D. 80 kg
E. 82 kg
A. 70 kg
B. 72 kg
C. 75 kg
D. 80 kg
E. 82 kg
21 Feb 2019, 03:46
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Bunuel
A + B + C = 84 * 3 = 252
A + B + C + D = 80 * 4 = 320
D = (A + B + C + D) - ( A + B + C) = 320 - 252 = 68.
E = D + 3 = 68 + 3 = 71.
B + C + D + E = 316.
B + C + D + 71 = 316.
B + C + D = 245.
We know,
A + B + C + D = 320
A + 245 = 320
A = 75.
C is the correct answer.
21 Feb 2019, 08:10
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If E = F ( due to a typo )
we have
1. A+B+C = 84*3 = 252
2. A+B+C+D = 80*4 = 320
After A's replacement , new E = D+3
3. B+C+D+D+3 = 79*4
from 1 and 2 , D = 320 -252 = 68
from 3, B+D = 316 - (2*68+3)
= 177
So from 1 ,
A = 252 -177 = 75 Option C
we have
1. A+B+C = 84*3 = 252
2. A+B+C+D = 80*4 = 320
After A's replacement , new E = D+3
3. B+C+D+D+3 = 79*4
from 1 and 2 , D = 320 -252 = 68
from 3, B+D = 316 - (2*68+3)
= 177
So from 1 ,
A = 252 -177 = 75 Option C
