A bag contains 5 red marbles, 4 blue marbles, and 3 yellow marbles. A student removes 1 marble without looking and records the colour. A student removes 1 marble without looking and records the colour. He then places the marble back in the bag before drawing another marble. What is the probability of drawing a colour other than blue, then drawing a yellow marble? Give your answer as a fraction.

5x+10 is the correct one

hope this

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584