1) The sum of two numbers is 40 and their difference is 4. The ratio of the numbers is : A) 11:9 B) 11:18 C) 21:19 D) 22:9 E) 22:19 Answer: Option AExplanation:Let the numbers be $x$ and $y$. Then,$\frac{x+y}{x-y}=\frac{40}{4}=10$$\Leftrightarrow (x+y)=10(x-y)$$\Leftrightarrow 9x = 11y \Leftrightarrow \frac{x}{y} = \frac {11}{9}$
