book Maths Puzzle Numerical Ability

A Right Triangle Problem.
Trying to calculate the height of a tree by its shadow cast on May 11.
Being a right triangle - one angle will be
90 degrees

( the 2nd angle will

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book Other Question
Find the mean,median, and mode of the following teperatures: 66,67,68,70,69,74,73,84,78,76, and 78 Five times a number subtracted from 3 times the number equals 20. Find the number.