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GEOMETRY QUESTION! Please Help

9. A design on the surface of a balloon is 5 cm wide when the balloon holds 71 cm of air. How much air does the balloon hold when the design is 10 cm wide? Explain the method you use to find the amount of air.

User Yohei
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142cm of air I think... I divided 142 buy 2. also then added 71 and 71 and multiplied buy 2 all were same answer
User Shida
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