15abc : abc = 101
( 15000 + abc ) : abc = 101
15000 : abc + abc : abc = 101
15000 : abc + 1 = 101
15000 : abc = 100
abc = 15000 : 100
abc = 150
Vậy ............................
15abc : abc = 101
( 15000 + abc ) : abc = 101
15000 : abc + abc : abc = 101
15000 : abc + 1 = 101
15000 : abc = 100
abc = 15000 : 100
abc = 150