1 out of 3
How many of the numbers 1 to 20 are not the sum of two primes?
1 out of 3
The product of four different positive integers is 100. What is the sum of these four integers?
3 out of 3
Find out which two distinct primes less than $7$ will give the largest highest common factor of these two expressions.
3 out of 3
Weekly Problem 39 - 2012
For how many values of $n$ are both $n$ and $\frac{n+3}{n-1}$ integers?
3 out of 3
Weekly Problem 24 - 2012
Can you put these very close fractions into order?
1 out of 3
If three brothers will get £20 more if they do not share their money with their sister, how much money is there?
1 out of 3
A recipe for flapjacks calls for a certain quantity of butter, sugar and oats. Given the amount of these ingredients I have, how many flapjacks can I make?
2 out of 3
Can you work out the ratio of shirt types made by a factory, if you know the ratio of button types used?
