book Maths Puzzle Numerical Ability

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

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book Other Question
Explain the difference between equivalent expressions and equivalent equations.

Show an example of each What steps do you follow to simplify 6^(5/4) / 6^(1/4) and what is your result?