- What 2 numbers that add up to 78 but when you subtract them is 20? Heeelp please?

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What is the percent yield of iron if the reaction of 66.3 g of iron(III) oxide produces 15.9 g of iron? Can someone please help me solve this problem in my calculus 2 review.? Does a change in frequency of AC supply affect the voltage? Wat is je favoriete eten? What jobs dont need any level of math i hate math?