Donna is making a coloured tower as shown.
She has thirty six small cubes, with equal numbers of red (R), blue (B) and yellow (Y). Each row is of one colour, and no two rows which are next to each other are the same colour. The top three rows are coloured as indicated. What colour must the bottom row be?
Select one option, then click Submit.
red
blue
yellow
can’t be done
can't be sure
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.
Junior Mathematical Challenge 1997 (1997)
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 →Junior Mathematical Challenge 1997 (1997)