수악중독

Suppose that \(\dfrac{2}{3}\) of \(10\) bananas are worth as much as \(8\) oranges. How many oranges are worth as much as \(\dfrac{1}{2}\) of \(5\) bananas? (A) \(2\) (B) \(\dfrac{5}{2}\) (C) \(3\) (D) \(\dfrac{7}{2}\) (E) \(4\) 정답 (C)

Doug can paint a room in \(5\) hours. Dave can paint the same room in \(7\) hours. Doug and Dave paint the room together and take a one-hour break for lunch. Let \( t\) be the total time, in hours, required for them to complete the job working together, including lunch. Which of the following equations is satisfied by \(t\)? (A) \( \left ( \dfrac{1}{5} + \dfrac{1}{7} \right ) (t+1) =1\)(B) \( \l..

Let \(k=2008^2 + 2^{2008}\). What is the units digit of \(k^2 + 2^k\) ? (A) \(0\) (B) \(2\) (C) \(4\) (D) \(6\) (E) \(8\) 정답 (D)