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El the Elephant wants to lift his five friends. Will this pulley suffice?
You can get zero by changing some of the plus signs. Which operation must come first?
Jeremiah wants to use every mode of transportation while sight-seeing. Where should he begin?
No car can stop instantaneously. How long does it take for the BrillCar to fully stop?
The participants in this Numbers Bunchers puzzle tell you what their products aren’t divisible by. How can you distribute all the numbers?
The inequality between arithmetic and geometric means allows us to find bounds for sums and products. What can't the four ages sum up to?
In this jigsaw map puzzle, the clues determine the locations of three of the pieces. Where can we place the fourth piece?
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