Initially Kevin had 25
Explanation:
Given that,
James have 20 more than Kevin
J = K + 20
If Kevin loose 10 then james will have 3 time Kevin
J = 3( K - 10)
Equate both the equation,
3(K-10) = K+20
3k - 30 = k +20
3k - k = 20 + 30
2k = 50
K = 25
So initially Kevin had 25