Respuesta :

Answer: 21cm longer.

Step-by-step explanation:

1. Y/R = 7cm, B/R = 7(4)cm

2. B/R = 28cm

3. 28cm - 7cm: as you are trying to find out how longer the b/r is relative to the y/r.

4. 28 - 7= 21cm.

In conclusion, the blue ribbon is longer than the yellow ribbon by 21cm.

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