Chloe can complete some work in 66 days, while Kate can complete the same work in 55 days. They started the work together, and when the work was half complete, Kate fell ill and Chloe had to finish the remaining work. How long did it take to complete the work?
Megan's roll number is a two digit number. Her friend Eva's roll number has the same digits as Megan's roll number, but with digits interchanged. If they add their roll number, and divide the sum by 11. Find the remainder of this division.
Can not be determined without knowing the roll number