Home › Capgemini Hiring › Quantitative Aptitude › Ages › The age of a mother 10 years ago was thrice her …
The age of a mother 10 years ago was thrice her son's age. 10 years hence, her age will be twice her son's. The ratio of their present ages is:
A12 : 5
B6 : 1
C7 : 3
D5 : 2
Answer & Solution
Correct answer: C. 7 : 3
1. Let present ages be M and S. Then M - 10 = 3(S - 10), so M = 3S - 20.
2. Also M + 10 = 2(S + 10), so M = 2S + 10.
3. 3S - 20 = 2S + 10 gives S = 30, M = 70. Ratio = 70 : 30 = 7 : 3.
_Source: RRB Group D CEN-02/2018 PYQ, Q.46._
Related questions
A car uses 4 litres of petrol for 60 km. Its mileage in km per litre is:A man covers a distance in 6 hours at 40 km per hour. To cover it in 4 hours he must traveA man travels equal distances at 40 km per hour and at 60 km per hour. His average speed iA train 200 m long crosses a 100 m platform at 36 km per hour. It takes:A train 150 m long runs at 54 km per hour. The time it takes to pass a pole is:A car covers 300 km at 50 km per hour. At 75 km per hour the same trip would take:Zaheeda doubles her speed on the same route. The time she takes:A journey takes 120 km at a steady 60 km per hour. The time taken is: