exam Maths Puzzle Numerical Ability

A yogurt company blends regular yogurt that is 4%fat with its no-fat yogurt to obtain low-fat yougurt that is 2% fat. How many pounds of non-fat yogurt must be mixed to obtain 60po

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x is greater than 6 and less than or equal to 12. I know how to graph the equation, but how is it "solved" as requested in the question? How do you know when an equation has infinitely many solutions? How do you know when an equation has no solution?(Post within plenty of explaining 75 words)