You have two vertical poles. One stands at 6ft. 6in, the other at 7ft. 7in. From the top of each pole tie a string to the bottom of the other pole.
At what height do the two strings cross?
Answer
42 inches.
You multiply the height of the two poles and then divide that by the sum of the two heights.
(78 x 91) divided by (78 + 91) = 42
