Suppose son name is 120,his brother name is 150 and his mother name is 210.find out his father's name???  Choose the correct choice from the following answers
A) 190
B) 210
C) 230
D) 240
E) 250
since difference between all name is =30   so father's name will be  210+30= 
<gadget id="calculator"> 210+30</gadget>
<output>240</output>
240.   ANSWER:240
<result>D</result>
Suppose son name is 120,his brother name is 150 and his mother name is 210.find out his father's name???