The ratio of pens to pencils that are used by Woodland's middle school students in 3/2. If there is a total of 160 middle school students, how many of them use pencils?

Number of students that use pen= 96Step-by-step. to 2 if their is a total of 160 middle school students how many of them use pencils. Ratio pens to pencil= 3:2 .

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+

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