Question 398432
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Hi
Let x represent how wide is the image of the drum is on the stadium screen
Question Sets Up the Proportion
 {{{(42/10.5) = (21/x)}}}  |cross multiplying to solve for x
 42x = 21*10.5
   x = 21*10.5/42
   x = 5.25 ft, the width of the drum on the stadium screen