The sum of two numbers is 40 and their difference is 4. The ratio of the numbers is
Choose the correct choice from the following
A) 11 : 9	B) 11 : 18	C) 21 : 19	D) 21 : 19	E) None
Sol.   Let the numbers be x and y.   Then, x+y / x -y = 40/4= 
<gadget id="calculator">40/4</gadget>
<output>10</output>
10   ⇔ (x+y)= 10(x-y)   ⇔ 9x = 11y   ⇔ x/y = 11 / 9.   11 : 9nswer 11 : 9
<result>A</result>
The sum of two numbers is 40 and their difference is 4. The ratio of the numbers is