I am a number between 30 and 60 my one's digit is three less than my tens digit I'm a prime number Part 1:Gus’ friend Russ guessed that his riddle was about the number 47 why can’t 47 be the answer

Combine like terms to create an equivalent expression. make sure to simplify coefficients and constants as well. -6/5-2/3v+4/15+1/3v

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?  

How many zeroes do we write when we write all the integers 1 to 243 in base 3?