Question 148394
x=length of the original paper
20.5=wide of the original paper

20.5=length of the 2nd paper
x/2=wide of the 2nd paper

the proportion between the sides are the same so
20.5/x = (x/2)/20.5

20.5/x=x/41

(20.5)41=x^2
x=sqrt(840.5)=29 (aprox)