a telephone pole 28m high casts a shadow of 20m. find the height of a electric pole which casts a shadow of 15m at the same time.
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use variation method
28x15=20x
x=420/20
x=21
so the height of the electric pole is 21 m
28x15=20x
x=420/20
x=21
so the height of the electric pole is 21 m
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