book Maths Puzzle Numerical Ability

I need to find the common denominator in this formula:

6/4x squared times 2/5x

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book Other Question

a rectangular picture is 12 by 16 inches. if a frame of uniform width contains an area of 165 square inches, what is the width of the frame. On the opening night of the Broadway musical Miss Saigon, the Rhapsody Theater sold 800 total tickets. An advanced ticket costs $14.50 and a ticket at the door costs $22.00. In all. $16,640 was taken in. How many tickets were sold at he door?