Problem
2009 AMC 10B Problem 4
A rectangular yard contains two flower beds in the shape of congruent isosceles right triangles. The remainder of the yard has a trapezoidal shape, as shown. The parallel sides of the trapezoid have lengths 15 and 25 meters. What fraction of the yard is occupied by the flower beds?
![[asy] unitsize(2mm); defaultpen(linewidth(.8pt)); fill((0,0)--(0,5)--(5,5)--cycle,gray); fill((25,0)--(25,5)--(20,5)--cycle,gray); draw((0,0)--(0,5)--(25,5)--(25,0)--cycle); draw((0,0)--(5,5)); draw((20,5)--(25,0)); [/asy]](/static/aops/3ee29f78e4a8eecdb8faec4092f2f1c361a869e4.png)
\text{(A) } \frac {1}{8} \qquad \text{(B) } \frac {1}{6} \qquad \text{(C) } \frac {1}{5} \qquad \text{(D) } \frac {1}{4} \qquad \text{(E) } \frac {1}{3}
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