Question

The length of a rectangle is 5 centimeters less than twice its width. The perimeter of the rectangle is 80 cm. What are the dimensions of the rectangle?

length = 23 cm; width = 14 cm
length = 22 cm; width = 18 cm
length = 25 cm; width = 15 cm
length = 24 cm; width = 16 cm

Answer 1

look: let a be the lenght and b be the wight.

so 2*(a+b)=80
a+b=40
a=2b-5

substitute 2b-5 for a and solve: 2b-5+b=40
3b-5=40
3b=45
b=15 wight
a=2*15-5
a=??? lenght

Answer 2

25?

Answer 3

YES so it is C

Answer 4

Thank youuuuuu :)

Answer 5

:)