book Maths Puzzle Numerical Ability

10to the power of6

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book Other Question

Use Eular's formula to find the number of edges in the polyhedron made up of 5 faces: 2 triangles and 3 restangles. A 13-ft ladder is leaning against a house. The distance from the bottom of the ladder to the house is 7 ft less than the distance from the top of the ladder to the ground. How far is the bottom of the ladder from the house?