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 2 of 5.
Djdave said:
1 decade ago
f1:f2:f3 = 4:7:9.
f1 + f2 + f3 - 24 = 56.
f1 + f2 + f3 = 80.
f1 = 4 / 20 * 80 = 16.
f2 = 7/20 * 80 = 28.
f3 = 9/20 * 80 = 36.
f1 + f2 + f3 - 24 = 56.
f1 + f2 + f3 = 80.
f1 = 4 / 20 * 80 = 16.
f2 = 7/20 * 80 = 28.
f3 = 9/20 * 80 = 36.
Pragathi said:
1 decade ago
Actually ago means past time so we have to add it's my doubt some times you will add some times you subtract please clarify it.
Virendra rajput said:
1 decade ago
Just look option which are having given ratio 4:7:9
A and D are ruled out then check 2"nd condition.
A and D are ruled out then check 2"nd condition.
Adinarayana said:
1 decade ago
Faruk explained detail but I didn't understand, how is it came 8, how did you take the 56+8+8+8.
Sam said:
1 decade ago
Search for the common multiplier.
Here 4 matches exactly i.e.,
4*4 = 16.
4*7 = 28.
4*9 = 36.
Here 4 matches exactly i.e.,
4*4 = 16.
4*7 = 28.
4*9 = 36.
(1)
Naveen kumar said:
1 decade ago
x(4+7+9) = 56+8+8+8.
Then we got x = 4.
For further answer each x term multiplied by 4.
Then we got x = 4.
For further answer each x term multiplied by 4.
Anu said:
1 decade ago
When should we use (+) and (-) symbols under this section means problems based on age.
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)
Vissu said:
1 decade ago
Sum of there ages is 56 before 8 years then after 8 years it must be 64.
Madhu said:
1 decade ago
Ago means we can subtract that given value, after means add that value.
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