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- Mon Nov 28, 2022 9:26 am
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO National 2021 Junior Problem 7
- Replies: 3
- Views: 13215
Re: BdMO National 2021 Junior Problem 7
Let the 3 digit number be (100a+10b+c) were a,b & c are integers between 0 and 9 dinosaur game , and a>0 . The condition that the number is 19 times greater than sum of its digit is (100a+10b+c)=19(a+b+c) or 81a−9b−18c=0 or 9a−b−2c=0 or a=b+2c9 Now we have to select b and c (between 0 and 9 ) such (...