If a number is divided by 15 , it leaves a remainder of 7. If thrice the number is divided by 5,then what is the remainder ???
Ans. - 1 why ?
Confusion here =>
N/15 = 15k + 7
Multiplying both side by 9
3N/5 = 5 (27k)+63 ;
3N/5 = 5 K + 3 ;
so remainder should be 3
What to do??