Let Present age of Sana = s Present age of Mona = m
Sana is senior to Mona by 18 years s=m+18............(1)
After 6 years Sana will be = s+6 Mona will be = m+6 Then Sana will be twice as old as Mona (s+6)=2(m+6) s+6=2m+12 s=2m+12-6 s=2m+6.............(2) Put the value of s from (2) to (1) 2m+6=m+18 2m-m=18-6 m=12 Put the value of m in (1) s=m+18 s=12+18 s=30
Present age of Sana = s = 30 years old Present age of Mona = m = 12 years old
