Jillian is trying to determine what helium tank pressure she needs to fill balloons for the student council dance. Find the unknown numbers in the table until you find the best answer to the question. Which cylinder pressure will Jillian need if she plans to fill 90 balloons?Tank Pressure and Balloon QuantityPressure in the helium cylinder (psi)Number of 9-inch balloons10030150?200?250?300?
At 100 psi, the cylinder fills 30 balloons. To fill 90 balloons, Jillian needs three times as much helium, so the pressure must be three times 100 psi: 300 psi. The correct choice is 300.
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