16 December

Arrange the digits 1-9 in a 3×3 square so that: the median number in the first row is 6; the median number in the second row is 3; the mean of the numbers in the third row is 4; the mean of the numbers in the second column is 7; the range of the numbers in the third column is 2, The 3-digit number in the first column is today's number.
median 6
median 3
mean 4
today's numbermean 7range 2

Show answer

21 December

Today's number is a multiple of three. The average (mean) of all the answers that are multiples of three is a multiple of 193.
Tags: averages, mean


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


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


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