Present ages of Seema and Naresh are in the respective ratio of 5:7. Five years hence the ratio of their ages become 3: 4 respectively. What is Naresh’s present age in years ?
Let their ages be s,n respectively, we have s/n=5/7,
(S+5)/(n+5)=3/4,
4s+20=3n+15
but we have, s=5n/7
so, 20n/7+20=3n+15
Solving for n we have 35.
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