The radius of a spherical balloon decreases from 35 cm to 21 cm when air is pumped out of it. Find the ratio of surface areas of the balloons in the two cases and the percentage decrease in surface area.
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The radius of a spherical balloon decreases from 35 cm to 21 cm when air is pumped out of it. Find the ratio of surface areas of the balloons in the two cases and the percentage decrease in surface area.
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