exam Maths Puzzle Numerical Ability

how do you do number 4 in the Pre-Algebra workbook..Chapter 10 section 1?

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exam Other Question

if beer is 6% alcohol mass, how much beer do you to drink to consume 3.0 ounces of alcohol
what is the percetage of gold if bryce mixed 6.50 pounds of 18 k gold (50.0pure gold)wit can someone help me multiply this rational expression?

4x-24/x^2-2x X 8x/6-x

Thanks so much!
ac