easymath

If Mr. Flynn is 90 centimeters plus half his height, how tall is he?

180 centimeters. Half of his height is 90 centimeters. Therefore his full height has to be double of that.

Why this works

This riddle plays with the relationship between Mr. Flynn's height and a simple mathematical equation. When it states that Mr. Flynn is "90 centimeters plus half his height," we can set up an equation where his height (let's call it H) is equal to 90 centimeters plus half of H (which is H/2). So, if we express this mathematically: H = 90 + (H/2). By multiplying everything by 2 to eliminate the fraction, we get 2H = 180 + H. Subtracting H from both sides gives us H = 180 centimeters. Thus, Mr. Flynn's height is indeed 180 centimeters!

Common Wrong Answers

“90 centimeters”

This guess assumes Mr. Flynn's height is equal to the additional 90 centimeters, but the riddle states that the 90 centimeters is just half of his height.

“270 centimeters”

This guess incorrectly interprets the relationship between Mr. Flynn's height and the 90 centimeters. It miscalculates by adding the 90 centimeters to half of an assumed taller height.

“1800 centimeters”

This guess is an extreme overestimation, likely misunderstanding the term 'half his height' and erroneously assuming a much larger overall height.

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