Question
A piece of ribbon 640 cm long is cut into 3 pieces D, E and F. E is 71 cm longer than F but 63 cm shorter than D. What is the length of D?
4 m

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A piece of ribbon 640 cm long is cut into 3 pieces D, E and F. E is 71 cm longer than F but 63 cm shorter than D. What is the length of D?