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
the equation 14y-y(squared)=0 has two solutions. whats the other? Rewrite the equation -2X + 3Y = -15 as a function of X.
A) f(x) = 2/3x - 5 B) f(x) = 2x - 15 C) f(x) = -3y - 15 D) f(x) = 3/2y + 7.5