exam Maths Puzzle Numerical Ability

How many pounds of extra-lean-hamburger that is 7% fat must be mixed with 30 pounds of hamburger that is 15% fat to obtain a mixture that is 10% fat?

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exam Other Question

solve each equation The Distributive Property Fraction:

2/9 (x+18)=36
solve: x/x^2 - 1 + 1/x - 1 = 1/x + 1

I could be wrong.... no solution?