AMC 10 B AMC 12 B Problem 10 Working together they can lay n 9

Amc 10 b amc 12 b problem 10 working together they

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2008 AMC 10 B, Problem #182008 AMC 12 B, Problem #10“Working together they can lay(n9+n10-10)bricks in an hour,wherenis the total number of bricks in the chimney.”Difficulty:Medium-hardNCTMStandard:AlgebraStandard:representandanalyzemathematicalsituationsandstructures using algebraic symbols.Mathworld.com Classification:None
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A cylindrical tank with radius 4 feet and height 9 feetis lying on its side. The tank is filled with water to adepth of 2 feet. What is the volume of the water, incubic feet?32008 AMC 10 B, Problem #19“Draw the cross section of the cylinder, find out thearea of circle that is filled with water.”Mathworld.com Classification:Geometry>Solid Geometry>Cylinders>CylinderGeometry>Plane Geometry>Arcs>Circular Sector
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The faces of a cubical die are marked with the numbers1, 2, 2, 3, 3, and 4.The faces of a second cubicaldie are marked with the numbers 1, 3, 4, 5, 6, and8. Both dice are thrown. What is the probability thatthe sum of the two top numbers will be 5, 7, or 9 ?9
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