RRB Group-D Model Paper 19 with answers for online practice

According to the given information, Average age of father and son is 22 years.
Ratio of their ages = 10 : 1
Finding the age of the son by verifying options,
Option 1 → 24 years
Then father’s age is 240
Average = 240 + 24/2 = 264/ 2, which is not correct
Option 2 → 4 years
Then father’s age is 40
Average = 40 + 4/2 = 44/ 2 = 22, which is correct
Option 3 → 40 years
Then father’s age is 400
Average = 400 + 40 /2 = 440/ 2, which is not correct
Option 4 → 6 years
Then father’s age is 60
Average = 60 + 6 /2 = 66/ 2 = 33, which is not correct
Hence, option 2 is the correct answer.