I am sewing a skirt and i need a total of 390cm of different coloured ribbon. The white ribbon needs to be 40cm longer than the red ribbon while the blue ribbon needs to be 3 times as long as the red ribbon. the purple ribbon is half as long as the white ribbon. How long is each piece of ribbon

Answer 1

Total = 390 cm.
Red = X cm.
White = x+40 cm.
Blue = 3x cm.
Purple = (x+40)/2 = 0.5x+20.

x + (x+40) + 3x + (0.5x+20) = 390.
5.5x + 60 = 390,
X = 60 = Red.
Calculate the length of the other ribbons.