Question 175287
20*30=600cm^2 is the picture area.
600-264=336
2x*3x=336
6x^2=336
x^2=336/6
x^2=56
x=sqrt56
x=7.48 
2*7.48=14.96 for one dimention.
3*7.48=22.44 for the other dimention.
Proof:
14.96*22.44=336
336~336