| The respective ratio between the present ages of son, mother, father and grandfather is 2: 7: 8: 12. The average age of son and mother is 27 yr. What will be mother's age after 7 yr? |
A) 40 yr
B) 48 yr
C) 41 yr
D) 49 yr
E) None of these
Correct Answer: D
Solution :
| Total age of son and mother, |
| \[2x+7x=2\times 27\] |
| \[9x=54\]\[\Rightarrow \,\]\[x=6\] |
| \[\therefore \] Mother's age after 7 yr |
| \[=7\times x+7=7\times 6+7=49\,yr\] |
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