Henk Reuling

Maths-teacher in the Netherlands, at the Liemers College; programming FREE math-games ( plays basketball and puzzles a lot; #mtbos

[Henk Reuling @HenkReuling]

@KarenCampe @jamestanton But in the first case bins & balls ARE labeled

[Henk Reuling @HenkReuling]

@KarenCampe @jamestanton Flaw in 2&1&1: with 2 balls in first bin there are 12 ways: 4C2 • 2 = 12, or write them out:
[12][3][4] + [12][3][4]
[13][2][4] + [13][4][2]
[14][2][3] + [14][3][2]
[23][1][4] + [23][4][1]
[24][1][3] + [24][3][1]
[34][1][2] + [34][2][1]
Also 12 with other bins with 2: 3•12 = 36

[Henk Reuling @HenkReuling]

@PuzzleADayBlog I think it's 7 (but I'm not 100% sure that 6 could not be possible)

[Henk Reuling @HenkReuling]

@dment37 Area = 20

[Henk Reuling @HenkReuling]

@zainbs359 Area = 729/50 · √19

[Henk Reuling @HenkReuling]

@arjanvandermeij @SvdK @volkskrant Rudy Kousbroek schreef in 1990 al in het boek "Einsteins poppenhuis", in het essay getiteld 'kunstmatige domheid', waarin hij oa zegt "ongeletterdheid is niet salonfähig, ongecijferdheid helaas wel". Helaas is dit alleen maar verslechterd.

[Henk Reuling @HenkReuling]

@dment37 8 × sqrt(7)

[Henk Reuling @HenkReuling]

@dment37 radius = -50+30√3 (area = π·radius² = ... easy)

[Henk Reuling @HenkReuling]

@GeometryPuzzles @rmtnezcalafat 135°

[Henk Reuling @HenkReuling]

@GeometryPuzzles @rmtnezcalafat 135°

[Henk Reuling @HenkReuling]

@Math_World_ 2 × depth = 12.5 + 8.25 = 20.75 → depth = 10.375 cm

[Henk Reuling @HenkReuling]

@PuzzleADayBlog The first ship, at 2 times speed 35 km/hr

[Henk Reuling @HenkReuling]

@Math_World_ radius = 85/4

[Henk Reuling @HenkReuling]

@diegorattaggi The long way... only using Pythagoras: blue : yellow = 3 : 2

[Henk Reuling @HenkReuling]

@diegorattaggi 1/3

[Henk Reuling @HenkReuling]

@PuzzleADayBlog

[Henk Reuling @HenkReuling]

@diegorattaggi radius outer circle = 6, then radius biggest green circle (right green one) = 2 and radius left green circle = 1.
With several times Pythagoras: radius smallest circle = 6/7; etc.

[Henk Reuling @HenkReuling]

@engineers_feed 256

[Henk Reuling @HenkReuling]

@Mirangu1 @puzzlist Fraction = 1/6