Question 744800
n for kuNal's age now
g for saGar's age now


6 years ago n-6 and g-6; 
{{{(n-6)/(g-6)=6/5}}}


4 years in the future n+4 and g+4;
{{{(n+4)/(g+4)=11/10}}}


---- A table or chart was a strategy for this problem but the two equations just found are enough to solve the problem----


Taking further steps with the equations gives us these:


5(n-6)=6(g-6)
5n-30=6g-36
5n-6g=30-36
{{{highlight(5n-6g=-6)}}}


10(n+4)=11(g+4)
10n+40=11g+44
10n-11g=44-40
{{{highlight(10n-11g=4)}}}


Multiply the first one by 2 subtract it from the second one:
{{{10n-11g-(10n-12g)=4-(-12)}}}
{{{-11g+12g=16}}}
{{{highlight(g=16)}}} from which you can easily finish solving for n.