If they cross at a height of 2m how far apart are the walls?

kindly provided by Simon Geard Two ladders, one 4m long the other 5m long, are placed against opposite walls of an alleyway and in opposite directions.
If they cross at a height of 2m how far apart are the walls?
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Kindly provided by UKMT A cube is inscribed in a sphere of diameter 1 metre. What is the surface area of the cube? In the grid below, each of the blank squares and the square marked X are to be filled by the mean of the two numbers in its adjacent squares.
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If your guess is too high then then your number, and all higher numbers in the grid, are removed. If your guess is too low then then your number, and all lower numbers in the grid, are removed. 1. How many attempts do you need to guarantee a correct result? 2. What is the expected number of attempts required for a correct answer? |
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June 2017
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