1. rectangle a measures 12 cm by 3 cm. rectangle b is a scaled copy of rectangle a.
select all of the measurement pairs that could be the dimensions of rectangle b.
a. 6 cm by 1.5 cm
b. 10 cm by 2 cm
c. 13 cm by 4 cm
d. 18 cm by 4.5 cm
e. 80 cm by 20 cm

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

All you have to do is multiply