The ratio of two numbers is 5 to 1. The sum is 18. What are the two numbers?  Answers.
A) 17 B) 18 C) 19 D) 20 E) 21
Solution   Let x be the first number. Let y be the second number   x / y = 5 / 1   x + y = 18   Using x / y = 5 / 1, we get x = 5y after doing cross multiplication   Replacing x = 5y into x + y = 18, we get 5y + y = 18   6y = 18   y = 3   x = 5y = 5 × 3 = 15   As you can see, 15/3 = 5, so ratio is correct and  3 + 15= 
<gadget id="calculator"> 3 + 15</gadget>
<output>18</output>
18, so the sum is correct.   Answer 18
<result>B</result>
The ratio of two numbers is 5 to 1. The sum is 18. What are the two numbers?