Hi
The length of a rectangle is 8 cm more than two times the width
Let x and (2x+8cm) represent the widthe and length respectively
Question states***
2(2x+8) + 2x = 40cm
Solving for x
6x = 24
x = 4cm. the width, the length is 16cm. (2*4cm + 8cm)
CHECKING our Answer***
2*16cm + 2*4cm = 40cm