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Eight Dominoes

Using the 8 dominoes make a square where each of the columns and rows adds up to 8

Score

There are exactly 3 ways to add 4 odd numbers to get 10. Find all the ways of adding 8 odd numbers to get 20. To be sure of getting all the solutions you will need to be systematic. What about a total of 15 with 6 odd numbers?

Medal Muddle

Countries from across the world competed in a sports tournament. Can you devise an efficient strategy to work out the order in which they finished?

John's Train Is on Time

Age 11 to 14 Challenge Level:
A train leaves the station on time. After it has gone 8 miles the driver looks at his watch and sees that the hour hand is exactly over the minute hand.

The average speed of the train over the 8 miles was 33mph.

When did the train leave the station?