Let the present ages of Parag and Sapna be 21x yr and 19x yr, respectively. 6 yr ago, Parag's age =21x−6 yr Sapna's age =19x−6 yr Now, according to the question.
21x−6
19x−6
=
9
8
168x−48=171x−54 ⇒171x−168x=54−48 ⇒3x=6 ∴x=2 Sapna's present age =19×2=38yr ∴ Lina's age =38−12=26yr