CAT Exam 2021 Slot 3 Solved Paper

Initially number of matches $= 40$
Now matches won $= 12$
Now let remaining matches be $x$
Now number of matches won $= 0.6x $
Now as per the condition :
${12 + 0.6x}/{40 + x} =1/2 $
$4 +1.2x=40+x $
$0.2x=16 $
$x=80$
Now when they won 90% of remaining = $80(0.9) =72 $
So total won $= 84 $