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Hello I need an answer and explanation on how to solve this question:

/in /by

Hello I need an answer and explanation on how to solve this question:
A merchant has coffee worth $60 a pound that she wishes to mix with 70 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. How many pounds (ib) of the $60 coffee should be used.

Thanks

 
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