Continue with rooms: find criterion that one can do a circle.
Solving some equations, like x+2y=4; x-y=1.
Bacteria in a glass problem
A, B, C pay $1 each, having only $2, $3 and $4 dollar coins.
Areas under a graph?
Experiment: water; stones
Solving some equations, like x+2y=4; x-y=1.
Bacteria in a glass problem
A, B, C pay $1 each, having only $2, $3 and $4 dollar coins.
Areas under a graph?
Experiment: water; stones
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