book Maths Puzzle Numerical Ability

Find the mean,median, and mode of the following teperatures: 66,67,68,70,69,74,73,84,78,76, and 78

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book Other Question

3[2+v]-4v=v+16 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