Three numbers are in the ratio 3:5:7. The largest number value is 42. Find difference between Smallest & largest number is?  Choose the correct choice from the following choices.
A) 24
B) 26
C) 27
D) 28
E) 32
== 3:5:7   Total parts = 15   = The largest number value is 42   = The largest number is = 7   = Then 7 parts -----&gt; 42 ( 7 * 6 = 42 )   = smallest number = 3 &amp; Largest number = 7   = Difference between smallest number &amp; largest number is = 7 - 3= 
<gadget id="calculator">7 - 3</gadget>
<output>4</output>
4= Then 4 parts -----&gt; 24 (4 * 6 = 24)   24)
<result>A</result>
Three numbers are in the ratio 3:5:7. The largest number value is 42. Find difference between Smallest & largest number is?