Sunday Times Teaser 2947 – 55 Divisions
by Tom Wills-Sandford
Published March 17 2019 (link)
To mark her 55th birthday, Martha, a school teacher, gave each of her nine pupils a sheet of paper with a single different digit from 1 to 9 written on it.
They stood at the front of the classroom in a row and the 9-digit number on display was divisible by 55. Martha then asked the first 3 in the row (from the left) to sit down. The remaining 6-digit number was also divisible by 55. The next 3 then sat down and the remaining 3-digit number was also divisible by 55.
The 9 digit number was the smallest possible. What was it?