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 Quantity Pressure in the helium cylinder (psi) Number of 9-inch balloons 100 30 150 ? 200 ? 250 ? 300 ?
The table shows that 100 psi fills 30 balloons. To fill 90 balloons, Jillian needs three times as much helium because 90 ÷ 30 = 3. Tripling the pressure gives 100 × 3 = 300 psi, so the best answer is 300 psi.
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