Find the area of trapezoid $DUCK$ shown below. [asy] unitsize(2mm); defaultpen(linewidth(.7pt)+fontsize (10pt)); pair D=(0,0), U=(5,12), C=(20,12), K=(36,0), F=(5,0); draw(D--U--C--K--cycle); draw(U--F, linetype("8 4")); draw(rightanglemark(U, F,K,25)); label("$D$",D, SW); label("$U$",U, N); label("$C$",C, NE); label("$K$",K, SE); label("5",midpoint(D--F),S); label("13",midpoint(D--U),NW); label("15",midpoint(U--C),N); label("20",midpoint(C--K),NE); [/asy]

306 sq. units

Step-by-step explanation:

Coordinates of the trapezoid:

Area of trapezoid = 1/2(Base1 + Base2)*Height

Bases have length of:

Height is:

Area:

answer: for each 3 girls there is 2 boys . 3: 2

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answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.