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Advent calendar 2017
2 December
All 2017 advent puzzles
~
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There are three cards; one number is written on each card. You are told that the sums of pairs of cards are 99, 83 and 102. What is the sum of all three cards?
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Adding up all three sums of pairs (284) will give twice the sum of the three numbers. So the sum of the three numbers is 142.
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parabolas
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dominos
prime factors
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matrices
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people maths
consecutive integers
games
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binary
multiplication
chalkdust crossnumber
medians
tangents
division
geometric mean
the only crossnumber
rugby
lists
powers
dodecagons
products
regular shapes
2d shapes
geometric means
sequences
circles
decahedra
factors
complex numbers
logic
lines
shapes
even numbers
probabilty
dates
grids
triangle numbers
routes
perfect numbers
xor
cards
chocolate
number
expansions
albgebra
folding tube maps
shape
star numbers
odd numbers
colouring
numbers
polynomials
angles
probability
trigonometry
dice
percentages
unit fractions
spheres
hexagons
combinatorics
differentiation
sums
prime numbers
planes
graphs
range
area
elections
surds
digital clocks
indices
tiling
integration
palindromes
pascal's triangle
fractions
sets
multiples
axes
chess
rectangles
cryptic crossnumbers
proportion
crosswords
multiplaction squares
calculus
neighbours
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christmas
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