book Maths Puzzle Numerical Ability

How many pounds of candy selling for $5.80 per pound should be mixed with 7 punds of candy selling for $2.40 per pund to obtain a mixture for $3.42 per pound?

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book Other Question

I am having trouble solving x2 -4/3x = -4/9 we can use any method either the quadratic formula, completing the square or the discriminant What is a rational number and how do you find one? Break the steps down for me.