Correct Answer - Option 3 : Only D
From option (1):
Ajay + Bharti + Dhruv = Bharti + Dhruv + Tara + 10
Ajay = Tara + 10
Bharti = Chaten – 6
Dhruv = Chaten + 2
From option (1) :
Chaten = 35 – 13 = 22 years
Present age of Tara is not given. So, present age of ajay cannot be determined and also ratio of present ages of Ajay and chetan cannot be determined.
Hence, this option is not sufficient alone.
From option (2):
Bharti + Chaten + Dhruv = 47
Chaten – 6 + Chaten + Chaten + 2 = 47
Chaten = 17 years
Present age of Ajay is not given. So, ratio of present ages of Ajay and Chaten cannot be determine.
Hence, this option is not sufficient alone
From option (3):
Ajay + Tara + Chaten = 48
Ajay + Ajay – 10 + Chaten = 48
2Ajay + Chaten = 58
Given data is not sufficient to find the answer.
Hence, this option is not sufficient alone.
From option (4):
Bharti + Dhruv = 24
Chaten – 6 + Chaten + 2 = 24
Chaten = 14 years
Ajay + Chaten = 30
Ajay = 30 – 14 = 16 years
Ratio, Ajay : Chaten = 16 : 14 = 8 : 7
From option (5) :
(Ajay + Bharti)/2 = 2 + (Bharti + Dhruv)/2
Ajay = 4 + Dhruv
Ajay = 4 + Chaten + 2
Ajay = Chaten + 6
Given data is not sufficient to find the answer.
Hence, this option is not sufficient alone.