Which of the four black shapes is identical to the red one? There may be more than one which is exactly the same.
[Ref: ZBQS] © Robert A. Hartmann.
Hint: Try and rotate them around in your head, and watch out for mirror images.
How many squares have been placed in the drawing below?
[Ref: ZKPU] © Kevin Stone
Hint: There are fewer than 20 squares.
In the solution below you can see 6 squares in the middle, with another 12 squares around the outside.
Each empty white square in the grid contains one of the numbers 1, 2, 3,..., 8. Each of the horizontal and vertical equations must be true and each number must be used exactly once.
[Ref: ZZVV] © Erich Friedman Erich Friedman's Website.
Hint: The top-left square contains the 6.
Using the BrainTracker grid below, how many words can you find? Each word must contain the central
F and no letter can be used twice, however, the letters do not have to be connected. Proper nouns are not allowed, however, plurals are. Can you find the nine letter word?
Excellent: 11 words. Good: 8 words. Average: 7 words.
[Ref: ZNZC] © Kevin Stone
Hint: Every word must contain the central letter.
cliff, cuff, DIFFICULT, fit, fitful, flit, flu, fluid, if, lift, tiff.
cliff, clift, cuff, cuif, DIFFICULT, duff, fid, fil, fit, fitful, flic, flit, flu, fluid, fluidic, fuci, fud, if, iff, lift, luff, tiff, tuff.
Two friends were driving from their home to Manchester, Kevin drove the first 90 miles, and Daniel took over the remainder of the journey.
On the way back, Kevin drove to begin with, and Daniel took over for the last 100 miles.
Who drove the most?
[Ref: ZIMH] © Kevin Stone
Hint: It doesn't matter how far it was to Manchester.
On the way there Kevin drove 90 miles, and on the way back drove the (total distance - 100 miles).
On the way Daniel drove the (total distance - 90 miles), and on the way back drove 100 miles.
So Kevin drove 90 + total - 100 = total - 10.
And Daniel drove total - 90 + 100 = total + 10.
So Daniel drove 20 miles more than Kevin. QED.