Multiple choice

The ratio between the ages of a father and a son at present is 5 : 2, respectively. Four years hence, the ratio between the ages of the son and his mother will be 1 : 2, respectively. What is the ratio between the present ages of the father and the mother respectively? वर्तमान में पिता और पुत्र की आयु के बीच का अनुपात क्रमशः 5 : 2 है। चार साल बाद पुत्र और उसकी माता की आयु के बीच का अनुपात क्रमशः 1 : 2 होगा। क्रमश: पिता और माता की वर्तमान आयु के बीच अनुपात क्या है?

  1. 7 : 9

  2. 3 : 4

  3. 4 : 3

  4. Can't be determined निर्धारित नहीं किया जा सकता है ।

  5. None of these इनमें से कोई नहीं
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We have father:son = 5:2 and son+4:mother+4 = 1:2. Let son = 2x, father = 5x. Then (2x+4)/(mother+4) = 1/2, so mother+4 = 4x+8, meaning mother = 4x+4. Father:mother = 5x:(4x+4) = 5x:4(x+1). Without knowing x's value, the ratio cannot be simplified to a fixed numerical ratio. Option D is correct.

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