Let age of Purvi = N yr
Then, age of Anil = 1.5N yr
According to the question,
(1.5N + 8)/(N + 8) = 25/18

Correct Option: B

Let age of Purvi = N yr
Then, age of Anil = 1.5N yr
According to the question,
(1.5N + 8)/(N + 8) = 25/18
⇒ 27N + 144 = 25N + 200
∴ N = 56/2 = 28
Hence, present age of Purvi = 28 yr

∵ Total age of 9 students and a teacher = 10 x 16 = 160 yr
Total age of first 4 students = 4 x 19 = 76 yr
and total age of last 5 students = 5 x 10 = 50 yr

Correct Option: B

∵ Total age of 9 students and a teacher = 10 x 16 = 160 yr
Total age of first 4 students = 4 x 19 = 76 yr
and total age of last 5 students = 5 x 10 = 50 yr
∴ Age of teacher = 160 - 76 - 50 = 34 yr

Let the present age of Varun be M and present age of Kapil be N.
According to the questions,
M + N = 42 ...(i)
Again, according to the question, After 5 yr,
(M + 5)/(N + 5) = 15/11
⇒ 11M + 55 = 15N + 75
⇒ 11M - 15N = 20 ...(ii)

Correct Option: A

Let the present age of Varun be M and present age of Kapil be N.
According to the questions,
M + N = 42 ...(i)
Again, according to the question, After 5 yr,
(M + 5)/(N + 5) = 15/11
⇒ 11M + 55 = 15N + 75
⇒ 11M - 15N = 20 ...(ii)

On solving Eqs. (i) and (ii),
⇒ N = 17 yr
Hence, present age of Kapil = 17 yr

∵ Total age of father and mother = 35 x 2 = 70 yr
and total age of father, mother and son = 27 x 3 = 81 yr

Correct Option: B

∵ Total age of father and mother = 35 x 2 = 70 yr
and total age of father, mother and son = 27 x 3 = 81 yr
&there4: Age of son = 81 -70 = 11 yr

∵ Total age of Sachin and Saurabh = 36 x 2 = 27 yr
Let age of Saurabh = x yr
Then, age of Sachin = (x + 8) yr
According to the question, x + x + 8 = 72

Correct Option: C

∵ Total age of Sachin and Saurabh = 36 x 2 = 27 yr
Let age of Saurabh = x yr
Then, age of Sachin = (x + 8) yr
According to the question, x + x + 8 = 72
⇒ 2x = 64
∴ x = 32
Hence, Saurabh's present age = 32 yr