What will be Daisy’s age ?

The ratio between the present ages of Daisy and Rosy is 2:3 respectively. Four years ago, the ratio between their ages was 5:8 respectively.  What will be Daisy’s age after 7 years:

  1. 29 years
  2. 30 years
  3. 31  years
  4. None of these
kishan Default Asked on 30th July 2015 in Maths.
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1 Answer(s)

Answer: (3) 31 years
Explanation:-
The ratio between the present ages of Daisy and Rosy is 2:3.
Let the present age of Daisy = 2 X  &  the present age of Rosy = 3 X.
According to the  question,
(2 X – 4)/(3 X – 4) = 5/8
8 (2 X – 4) = 5 (3 X – 4)                         (by cross multiplication)
16 X  – 32 = 15 X – 20
16 X – 15 X = – 20 + 32
X = 12
Then, the present age of Daisy 2 X  = 2 x 12
= 24 years
Therefore, the age of Daisy after 7 years = 24 + 7
= 31 years.
Hence, the answer is (3) 31 years.

Anurag Mishra Professor Answered on 30th July 2015.
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