Winnie wrote the following riddle: i am a number between 60 and 100. my ones digits is two less than my tens digit. i am a primer number. what number does winnie's riddle describe? winnie's friend marco guessed that her riddle was about the number 79. why can't 79 be the answer to winnie's riddle?

He's wrong because 9 is two more than 7, not two less.

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

square root of 36/6 = 2.449489743

square root of 16/6 = 1.632993162

square root of 6 = 2.449489743

the answer is square root of 16/6 because the square root of 36/6 is the same answer as square root of 6 = 2.449489743