Lamppost is 20ft tall. Mary is 5'3" tall. When she stands 10ft from the pole, her shadow is 21 ft. When Jane stands next to her, her shadow is 30 ft. How tall is Jane? What is the equation?
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the shadow / the height of the two are equal,
5'3"/21' = x/30'
x = 10/7*5'3" = 10/7*63" = 90"
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