mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2018

13 December

There is a row of 1000 lockers numbered from 1 to 1000. Locker 1 is closed and locked and the rest are open.
A queue of people each do the following (until all the lockers are closed):
Today's number is the number of lockers that are locked at the end of the process.
Note: closed and locked are different states.

Show answer

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

irreducible numbers crossnumbers routes dice coordinates scales colouring integers speed symmetry perfect numbers clocks digits gerrymandering star numbers products time dates division taxicab geometry functions crosswords folding tube maps unit fractions chalkdust crossnumber rectangles money bases trigonometry chocolate 3d shapes multiples number menace chess square numbers perimeter hexagons parabolas planes wordplay median arrows graphs lines doubling partitions crossnumber people maths ave area digital clocks floors proportion angles triangles games means sequences elections percentages triangle numbers calculus shapes addition complex numbers advent geometry regular shapes probabilty square roots prime numbers cube numbers integration numbers averages dodecagons palindromes circles fractions rugby the only crossnumber quadratics probability differentiation cryptic clues sums shape pascal's triangle volume remainders cards dominos odd numbers spheres surds mean ellipses algebra squares grids range coins indices polygons factors 2d shapes factorials tiling cryptic crossnumbers logic sum to infinity multiplication books christmas balancing sport

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020