exam Maths Puzzle Numerical Ability

A chemist has one solution that is 40 percent pure glycoside and another solution that is 80 percent pure glycoside. How many pounds of each solution must be used to produce 100 pounds of a solution that is 60 percent glycoside?

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Rewrite the equation as a function of x

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Heather write an equation where the x intercept is 3 and y intercept is -5