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OpenStudy (anonymous):
I am stuck, my friends~
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OpenStudy (anonymous):
OpenStudy (anonymous):
I don't know why I got this wrong.
OpenStudy (welshfella):
let x hours be the time that amy takes to build the ramp. Melanies theresore will take 4x hours. We work out the rate of building/ hour for amy, melanie and both and this gives the equation 1/4x + 1/x = 1/2 Solve this for x . The time that melanie takes is 4x hours.
OpenStudy (welshfella):
can you solve that equation?
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