Quantitative Aptitude: Problems on Ages Set 14

1. The ratio of the age of brother to that of his sister at present is 9:6 and the ratio of the sister to that of his niece will be 1:2.What is the ratio of the present age of the brother to that of niece ?
   3:4
   1:2
   3:6
   2:5
   None of these
   Option A
   =9:6 :: 1:2
   =9:6::6:12
   =9:6:12=3:2:4
   
    



2. Jaya’s present age is one fourth of his mother’s age two years ago. Jaya’s mother’s age will be twice Riya’s age after 10 years. If Riya’s 12th birthday was celebrated 2 years ago, then what is Jaya’s present age ?
   6 years
   9 years
   7 years
   8 years
   None of these
   Option B
   Riya =12+2 =14
   Jaya’s mother = x+10 =2(10+14)
   x =48-10 = 38
   Jaya age = 36/4 =9 years
   
    



3. The sum of the age of mother and his son is 62 years. After 5 years, the age of mother will be five times that of the daughter. What is the age of the daughter ?
   9 years
   4 years
   5 years
   7 years
   None of these
   Option D
   Daughter age = 62-5(5-1)/5+1 = 62-20/6 = 7 years
   
    



4. The present age of Shreya is twice that of his sister. Five years hence the ratio of their ages will be 21:13. What is the present age of her sister ?
   8 years
   7 years
   6 years
   5 years
   None of these
   Option A
   2y+5/y+5 = 21/13
   26y+65 = 21y+105
   5y=40
   y = 8 years
   
    



5. 18 years ago the ratio of X’s age to Y’s age was 8:13.Present age of their ages ratio is 5:7.What is the present age of Y ?
   65 years
   70 years
   85 years
   75 years
   None of these
   Option B
   8y+18/13y+18 =5/7
   56y+126 = 65x+90
   9y = 36
   y =4
   Y = 13*4 + 18 = 70 years
   
    



6. Average age of a group of 32 persons is 26 years. If a new person is included then the average age rises by 1 year,then the present age of new person will be which of the following?
   59 years
   52 years
   55 years
   Cannot be determined
   None of these
   Option A
   
   
    



7. The ages of A and B are in the ratio of 8 : 5 respectively. After 5 years the ratio of their ages will be 7:5. What is the difference in years between their ages?
   5 years
   4 years
   2 years
   6 years
   None of these
   Option D
   
   
    



8. A is younger than D by 9 years. If the ratio of their ages is 7:9, find the age of D?
   37 years
   41 years
   39 years
   45 years
   None of these
   Option B
   y/y+9 = 7/9
   9y = 7y+63
   2y= 63
   y = 63/2 = 31.5 =32
   D age = 32+9 = 41 years
   
    



9. 8 years ago, Brijesh’s age was four greater than Rashi’s age that time. Also the ratio of Rashi’s age to Brijesh’s 8 years after will be 6 : 7. Find the ratio of Rashi’s age to that of Brijesh’s age 4 years after?
   1:2
   3:4
   5:6
   4:5
   None of these
   Option C
   Rashi = p, Brijesh = q
   8 years ago, (p-8) + 4 = (q-8) . This gives p – q = -4
   After 8 years, (p+8)/ (q+8) = 6/7. This gives 7p – 6q = -8
   Solve both equations, p = 16, q = 20
   So required ratio = (16+4) : (20+4) = 20 : 24 = 5 : 6
   
    



10. Rashi’s age is 10 years more than Riya’s age. Also Rashi was twice old as Riya 15 years ago. What will be the age of Rashi 6 years after?
    41 years
    40 years
    38 years
    35 years
    None of these
    Option A
    Riya = x, Rashi = x+10
    (x+10) – 15 = 2(x-15)