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Which of the following shaded regions has an area different from the other shaded regions?

Weekly Problem 30 - 2007
Three-quarters of the area of the rectangle has been shaded. What is the length of x?

These four touching circles have another circle hiding amongst them...

Can you work out the sum of the missing digits in this subtraction?

Given any positive integer n, Paul adds together the factors of n, apart from n itself. Which of the numbers 1, 3, 5, 7 and 9 can never be Paul's answer?

Weekly Problem 10 - 2012
If you know how long Meg's shadow is, can you work out how long the shadow is when she stands on her brother's shoulders?

Weekly Problem 16 - 2008
A 30cm x 40cm page of a book includes a 2cm margin on each side... What percentage of the page is occupied by the margins?

Weekly Problem 1 - 2006
The diagram shows two circles enclosed in a rectangle. What is the distance between the centres of the circles?

Weekly Problem 28 - 2006
What can you say about the rectangles that form this L-shape?

Can you work out which number will appear directly below 400 in this pattern?