Aptitude - Problems on Ages - Discussion
Discussion Forum : Problems on Ages - General Questions (Q.No. 11)
11.
The present ages of three persons in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. Find their present ages (in years).
Answer: Option
Explanation:
Let their present ages be 4x, 7x and 9x years respectively.
Then, (4x - 8) + (7x - 8) + (9x - 8) = 56
20x = 80
x = 4.
Their present ages are 4x = 16 years, 7x = 28 years and 9x = 36 years respectively.
Discussion:
41 comments Page 1 of 5.
Praveen said:
2 years ago
Present ages sum 56 right soo to go through options we have to find the sum of ages eight years ago.
There are persons soo each got eight year's ago age ---> 8*3=24.
Eight years ago sum=present sum+three members sum of eight years ago age.
The sum of ages at right years ago = 56+24=80 and check with the option that should be got the sum of three ages will be 80.
There are persons soo each got eight year's ago age ---> 8*3=24.
Eight years ago sum=present sum+three members sum of eight years ago age.
The sum of ages at right years ago = 56+24=80 and check with the option that should be got the sum of three ages will be 80.
(3)
Krati said:
4 years ago
Thanks everyone.
(1)
Andrew said:
5 years ago
@Swathi,
-8 because the total is calculated for 8 years ago.
-8 because the total is calculated for 8 years ago.
(1)
Swathi hj said:
6 years ago
Can any one explain how that -8 comes.
(1)
Krishan said:
6 years ago
8 years ago the sum of ages was 56.
At present, the sum of age will be 3*8+56 = 80.
At present, the sum of age will be 3*8+56 = 80.
(1)
Tirth Patel said:
7 years ago
4 + 7 + 9 = 20x.
Eight years ago* three persons(8*3)=24.
Sum of their ages was= 56.
24+56=80x.
80/20=4.
Then 4:7:9 multiply by 4.
(4*4)=16,
(7*4)=28,
(9*4)=36.
The Answer is 16, 28, 36.
Eight years ago* three persons(8*3)=24.
Sum of their ages was= 56.
24+56=80x.
80/20=4.
Then 4:7:9 multiply by 4.
(4*4)=16,
(7*4)=28,
(9*4)=36.
The Answer is 16, 28, 36.
(4)
Tanweer said:
7 years ago
8 year ago total age 56.
Now 8x3=24+56=80 answer is B.
Now 8x3=24+56=80 answer is B.
(1)
Jon said:
8 years ago
I didn't understand.
First of all, from where 80 came.
Secondly, how do we know that we must plus, 4x-8 and 7x-8 how come there is + in between. Isn't it 8 years ago. Then why plus?
Please, someone, explain in very simple manner.
First of all, from where 80 came.
Secondly, how do we know that we must plus, 4x-8 and 7x-8 how come there is + in between. Isn't it 8 years ago. Then why plus?
Please, someone, explain in very simple manner.
Pawan kumar said:
8 years ago
How to add 8?
Lavanya said:
8 years ago
8 years ago sum of their age is 56,
Present sum of their age is 80
Total parts of the ratio is 4+7+9 = 20
So, 80/20=4
4 * 4 ,7 * 4, 9 * 4 = 16, 28, 36.
Present sum of their age is 80
Total parts of the ratio is 4+7+9 = 20
So, 80/20=4
4 * 4 ,7 * 4, 9 * 4 = 16, 28, 36.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers