Year 11 Being resilient

Chris and Jo put two red and four blue ribbons in a box. They each pick a ribbon from the box without looking. Jo wins if the two ribbons are the same colour. Is the game fair?

A spider is sitting in the middle of one of the smallest walls in a room and a fly is resting beside the window. What is the shortest distance the spider would have to crawl to catch the fly?

Jo made a cube from some smaller cubes, painted some of the faces of the large cube, and then took it apart again. 45 small cubes had no paint on them at all. How many small cubes did Jo use?

Six samples were taken from two distributions but they got muddled up. Can you work out which list is which?

In this follow-up to the problem Odds and Evens, we invite you to analyse a probability situation in order to find the general solution for a fair game.

An observer is on top of a lighthouse. How far from the foot of the lighthouse is the horizon that the observer can see?

Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.

Can you make sense of the three methods to work out what fraction of the total area is shaded?

Do you have enough information to work out the area of the shaded quadrilateral?