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Simplifying 15(0.8n) + 20(0.2n) = 400 Remove parenthesis around (0.8n) 15 * 0.8n + 20(0.2n) = 400 Multiply 15 * 0.8 12n + 20(0.2n) = 400 Remove parenthesis around (0.2n) 12n + 20 * 0.2n = 400 Multiply 20 * 0.2 12n + 4n = 400 Combine like terms: 12n + 4n = 16n 16n = 400 Solving 16n = 400 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Divide each side by '16'. n = 25 Simplifying n = 25
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