exam Maths Puzzle Numerical Ability

Please help. I cannot set up an equation for this.
Mrs. X has 470 stocks with an average price of $74. How many stocks should she buy At $42/share to bring the average price pe

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exam Other Question
(rad)x-1)=x-3 i know I square them first but then i get lost. please help me. Solve the equation

44. 4/9x = 6

Any help with this equation would be Greatly</b> appreciated.