My maths teacher Addum Kwickly has 18 socks (9 pairs of socks).He puts on clean socks every three days.How many days can he wear these socks before he has to wash them all?
Select one option, then click Submit.
12
18
21
27
36
Select an option, then submit.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
Primary Mathematics Challenge (2022)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →Primary Mathematics Challenge (2022)