Brian's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Brian $4.20 per pound, and type B coffee costs $5.75 per pound. This month, Brian made 151 pounds of the blend, for a total cost of $717.90. How many pounds of type A coffee did he use?

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

3 qrs + 3/2 xy hope this : /

step-by-step explanation:

i believe the answers 600m