Three numbers are in the ratio 3:5:7. The largest number is 49. What is the difference between smallest and largest number?
Choose the correct answer:
A) 16
B) 20
C) 24
D) 28
E) 32
The three numbers are 3x, 5x, and 7x.   The largest number is 49 = 7*7, so x = 7.   The smallest number is   3*7= 
<gadget id="calculator">  3*7</gadget>
<output>21</output>
21.   49 - 21= 
<gadget id="calculator">49 - 21</gadget>
<output>28</output>
28   The answer is 28.
<result>D</result>
Three numbers are in the ratio 3:5:7. The largest number is 49. What is the difference between smallest and largest number?