Question
The ages of a mother and daughter are 36 years and 12 years, respectively. In how many years will the mother be twice the age of the daughter?
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RRB NTPC 2025 Under Graduate CBT 1 Question Paper PDF (20-Jun-2026) (Shift 3)
The correct answer is
12 years
Let the required number of years be \(x\). After \(x\) years the mother's age is \(36 + x\) and the daughter's age is \(12 + x\).
The condition is that the mother is twice as old as the daughter: \(36 + x = 2(12 + x)\).
Expanding the right side gives \(36 + x = 24 + 2x\).
Rearranging, \(36 - 24 = 2x - x\), so \(x = 12\).
Hence, after 12 years the mother will be twice the daughter's age.
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