Question 1014937
{{{F=A-30}}} <-- Fahad is 30 years younger than Abu
{{{(F+4)/(A+4)=2/5}}} <--- In 4 years, their ages will be in ratio 2:5.
.
.
{{{5(F+4)=2(A+4)}}}
{{{5F+20=2A+8}}}
Substitute from the first equation,
{{{5(A-30)+20=2A+8}}}
{{{5A-150+20=2A+8}}}
{{{5A-130=2A+8}}}
{{{5A=2A+138}}}
{{{3A=138}}}
{{{A=46}}}
Then,
{{{F=46-30}}}
{{{F=16}}}