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What time are you looking for?: At what time will the trains pass each other?
spektrum.de/raetsel/welche-uhrzeit-ist-gesucht/2266253

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Which number is being sought?: Which positive integer fulfills these conditions?
spektrum.de/raetsel/welche-zahl-ist-gesucht/2306095

Which numbers are we looking for?: How can the value of a and b be determined?
spektrum.de/raetsel/welche-zahlen-sind-gesucht/2264210

How can the knight move across as many squares as possible?: How can the knight make a tour across as many squares as possible on the chessboard?
spektrum.de/raetsel/wie-kann-der-springer-moeglichst-viele-felder-betreten/2264220

What time is being asked for?: At what time do the tips of the hands of a clock rest on the vertices of a right-angled triangle?
spektrum.de/raetsel/welche-uhrzeit-ist-gesucht/2264890

How many moves are needed?: After how many moves could the stone theoretically be on any of the ten squares?
spektrum.de/raetsel/wie-viele-zuege-werden-benoetigt/2265238

What value is being sought?: How many steps of the escalator would the manager have to climb if it didn't move?
spektrum.de/raetsel/welcher-wert-ist-gesucht/2266202

Which day of the week is being asked for?: Which day of the week was the 100th day of the year before Mr. Meier's birth?
spektrum.de/raetsel/welcher-wochentag-ist-gesucht/2266203

Hemme's mathematical puzzle: Which value are you looking for?: How many four-digit numbers satisfy these conditions?
spektrum.de/raetsel/welcher-wert-ist-gesucht/2266516

Hemme's mathematical puzzles: How should the digits be arranged?: How can the digits be arranged so that their sums are equal?
spektrum.de/raetsel/wie-muessen-die-ziffern-angeordnet-werden/2266523

Hemme's mathematical puzzle: Which value are we looking for?: What is the fifth term of the arithmetic sequence?
spektrum.de/raetsel/welcher-wert-ist-gesucht/2266533

Hemme's mathematical puzzle: What sum is sought?: How much profit does the farmer make when selling his cow?
spektrum.de/raetsel/welche-summe-ist-gesucht/2266770

Hemmes mathematical puzzles: What time are you looking for?: What time does this particular clock show?
spektrum.de/raetsel/welche-uhrzeit-ist-gesucht/2266965

Hemme's mathematical puzzle: Which numbers are we looking for?: What are the three natural numbers in the equation?
spektrum.de/raetsel/welche-zahlen-sind-gesucht/2266971

Hemme's mathematical puzzle: Which numbers are you looking for?: Which prime twins are you looking for?
spektrum.de/raetsel/welche-zahlen-sind-gesucht/2264888

Hemme's mathematical puzzle: How else can the chessboard be disassembled?: What other solution is there?
spektrum.de/raetsel/wie-kann-das-schachbrett-noch-zerlegt-werden/2264247

Hemme's mathematical puzzle: Which date are you looking for?: On which day do the two clocks show exactly this time again?
spektrum.de/raetsel/welches-datum-ist-gesucht/2263746

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