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Air pressure, gauge pressure

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Hi. Can someone please walk me through how to do the following problem?

Suppose that when you ride on your 7.70-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 70.5 lb/in^2 and the area of contact between each tire and the road is 7.13 cm^2, what is your weight?

Thank you!

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