An herbalist has 45 oz of herbs costing $3 per ounce. How many ounces of herbs costing $2 per ounce should be mixed with these 45 oz of herbs to produce a mixture costing $2.60per ounce?
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let the ounces to be mixed be x
(45 + x ) 2.60 = 2* x + 45*3
117 + 2.60x = 2x + 135
2.60 x-2x = 135 -117
0.60 x = 18
x = 30 oz...........................ANSWER
answer is 30 ounces of herbs costing $2 per ounce should be mixed
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