# Puzzles

## Archive

Show me a random puzzle**Most recent collections**

#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

square roots arrows clocks trigonometry games averages ave lines routes mean money integers volume geometry multiples shapes dodecagons prime numbers 3d shapes dice logic sum to infinity division chess surds numbers palindromes triangle numbers crosswords books parabolas wordplay functions probability percentages symmetry triangles complex numbers perfect numbers probabilty doubling people maths sequences colouring 2d shapes cryptic crossnumbers folding tube maps remainders chalkdust crossnumber factors number ellipses chocolate bases algebra square numbers cube numbers pascal's triangle coordinates multiplication circles polygons quadratics perimeter fractions balancing floors means sport differentiation taxicab geometry scales partitions factorials cards digits crossnumbers planes star numbers integration area addition calculus cryptic clues rugby hexagons squares indices graphs proportion grids advent angles time odd numbers coins rectangles sums christmas regular shapes dates speed shape spheres irreducible numbers menace unit fractions## 22 December

22 is two times an odd number. Today's number is the mean of all the answers on days (including today) that are two times an odd number.

Clarification: You are taking the mean for answers on days that are two times an odd numbers; ie. the days are two times odd, not the answers.

## 16 December

Today's number is four thirds of the average (mean) of the answers for 13th, 14th, 15th and 16th December.