The relationship between quantities m and n is expressed by the equation 15m = 5(n - 42). If the difference between the two chosen values of n is 30, what is the difference in the corresponding values of m?
Choices:  A) 30/11  B) 42/11  C) 60/11  D) 150/11  E) 10
Another Simple way   15m=5(n-42)   Assume n = 42 to make one side equal to 0   then 15m=0   and m = 0   Repeat it by assuming n as 42+30 i.e 72   15m= 5(72-42)   15m=150   m=150/15= 
<gadget id="calculator">150/15</gadget>
<output>10</output>
10 - 0= 
<gadget id="calculator">10 - 0</gadget>
<output>10</output>
10   Answer : 10
<result>E</result>
The relationship between quantities m and n is expressed by the equation 15m = 5(n - 42). If the difference between the two chosen values of n is 30, what is the difference in the corresponding values of m?