| A father is nine times as old as his son and the mother is eight times as old as the son. The sum of the father's and the mother's age is 51 yr. What is the age of the son? |
A) 7 yr
B) 5 yr
C) 4 yr
D) 3 yr
Correct Answer: D
Solution :
| Let the age of the son be x yr. |
| Then, father's age = 9x |
| and mother's age = 8x |
| Again, \[9x+8x=51\] |
| \[\Rightarrow \] \[17x=51\] |
| \[\Rightarrow \] \[x=\frac{51}{17}\] |
| \[\therefore \] \[x=3yr\] |
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