Question

Three identical rectangles are put together to form rectangle ABCD, as shown in the figure below.Given that the length of the shorter side of each of the smaller rectangles is 5 unit, what is thearea of rectangle ABCD? sq. unit.

Answer 1

We can see that there are $2$ rectangles lying on top of the other and that is the same as the length of one rectangle. Now we know that the shorter side is $5$, if we take the information of the problem, and the bigger side is $10$, if we do $5 \cdot 2 = 10$. Now we get the sides of the big rectangles being $15$ and $10$, so the area is $\boxed{\textbf{(E)}\ 150}$.