Let ' m ' be the number of matches Guava played till now. They won ' 0.4 m ' matches. After playing another ' n ' matches and wining all of them, their winning percentage will improve to 50 . i.e, ‌
0.4m+n
m+n
=0.5 m=5n Playing 15 more matches and wining all of them, their winning percentage will improve from 50 to 60 . i.e ‌
0.4m+n+15
m+n+15
=0.6 Solving, we get 6+0.4n=0.2m Substituting m=5n, we get 6+0.4n=n n=10&m=50 Hence, Guava club played 50 matches so far. The answer is option A.