Answer :
lengthxwidth=area and rectangle Y/B is twice as big as X so
7(x+1)=1/2(4)(3x+6)
7x+7=1/2(12x+24)
x=5
Rectangle X=7(5+1)=42
Rectangle Y=4(3*5+6)=84
84 is twice as big as 42 :D
7(x+1)=1/2(4)(3x+6)
7x+7=1/2(12x+24)
x=5
Rectangle X=7(5+1)=42
Rectangle Y=4(3*5+6)=84
84 is twice as big as 42 :D