60 feet
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basically, you can create an equation based on conversions: y = 4x. x can be the amount of centimeters and y can be the amount of feet. the reason x is cm is because the amount of cm multiplied by four would equal y, which is the amount of ft.
using this new equation, plug in the value of cm that was given:
y = 4x
y = 4(15)
y = 60
so, sixty feet!!