Aptitude - Problems on Ages - Discussion
Discussion Forum : Problems on Ages - General Questions (Q.No. 13)
13.
A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present?
Answer: Option
Explanation:
Let the mother's present age be x years.
| Then, the person's present age = |  |
2 | x |  |
years. |
| 5 |
 |
|
2 | x + 8 | |
= | 1 | (x + 8) |
| 5 | 2 |
2(2x + 40) = 5(x + 8)
x = 40.
Discussion:
59 comments Page 3 of 6.
Malu said:
1 decade ago
Ratio of present age of mother and son is 5:2.
After 8 years ratio becomes 2:1.
So x = 8*(2-1)/5-4 = 8.
Mothers age is 8*5 = 40.
After 8 years ratio becomes 2:1.
So x = 8*(2-1)/5-4 = 8.
Mothers age is 8*5 = 40.
Simran said:
1 decade ago
Hey please someone tell me why they have taken LCM only one side.
2X/5+8 = 1/2x+8.
It should be like this: 2x+40/5 = x+16/2.
2X/5+8 = 1/2x+8.
It should be like this: 2x+40/5 = x+16/2.
Shravya said:
1 decade ago
@Yuga how you simplified it can you please explain it. Your method is good but please can you tell how you calculated it.
Harish said:
1 decade ago
I have one doubt please tell me.
They asked about present age but we have added 8 years. How it will be the present age?
They asked about present age but we have added 8 years. How it will be the present age?
Sanju said:
1 decade ago
Why should it can't be 32 there is a possibility to get 32 as a answer?
Can anyone give clear explanation about this?
Can anyone give clear explanation about this?
Varun said:
1 decade ago
Vijay, I was wondering about the same I think your right.. :)
The ans should be 40-8-32 present age of person's mother.
The ans should be 40-8-32 present age of person's mother.
Vijay said:
1 decade ago
Hey but does x=40 means after 8 years. They have asked for present age. Doesn't it should be x=32, the present age ?
Sumit said:
1 decade ago
Person mother.
2 5.
1 2 (8 year hence).
Then mother's present age is.
M = (5*8*1)/(5*1) - (2*2).
M = 40.
2 5.
1 2 (8 year hence).
Then mother's present age is.
M = (5*8*1)/(5*1) - (2*2).
M = 40.
Harihara said:
8 years ago
32 will be the answer. In all the solutions 8 is added to find the age. So definitely 40 is not the answer.
Harshitha said:
6 years ago
The correct answer would be 32 as it is mentioned in the question the present age, so it must be 40-8=32.
(3)
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