The question is reprouduced here.

Find the largest 5 digit number Which is exactly divisible by 48

largest 5-digit number= 99999 |
Hint: largest 5-digit number is 9 written 5 times. Similarly largest 1-digit number is 9. Similarly largest 2-digit number is 99 and so on . |

99999/48 |
Hint: Remainder is the excess amount in the dividend (99999). Therefore this excess amount is deducted to get the exact dividend divisible by 48. |