2 out of 3
Replace each letter with a digit to make this addition correct.
2 out of 3
Is it possible to rearrange the numbers 1,2......12 around a clock face in such a way that every two numbers in adjacent positions differ by any of 3, 4 or 5 hours?
2 out of 3
How is it possible to predict the card?
2 out of 3
What could be the scores from five throws of this dice?
2 out of 3
Find the values of the nine letters in the sum: FOOT + BALL = GAME
3 out of 3
Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
3 out of 3
Ann thought of 5 numbers and told Bob all the sums that could be made by adding the numbers in pairs. The list of sums is 6, 7, 8, 8, 9, 9, 10,10, 11, 12. Help Bob to find out which numbers Ann was thinking of.
3 out of 3
Delight your friends with this cunning trick! Can you explain how it works?
1 out of 3
The country Sixtania prints postage stamps with only three values 6 lucres, 10 lucres and 15 lucres (where the currency is in lucres).Which values cannot be made up with combinations of these postage stamps? Prove that all other values can be made up.
2 out of 3
If p is a positive integer and q is a negative integer, which of these expressions is the greatest?
