



 
Hi James, You need 45,000 pounds of an 80% MgO product which thus contains $0.80 \times 45,000 = 36,000$ pounds of MgO. Suppose you take $x$ pounds of the 55% MgO product. How many pounds of MgO will that contain? You then need $45,000  x$ pounds of the 89% MgO product. How many pounds of MgO will that contain? The total number of pounds of MgO you need is 36,000. Solve for $x.$ Penny  


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