If Rahul finds that he is 12th from the right in a line of boys and 4th from the left, how many boys should be added to the line such that there are 28 boys in the line?
Choose the correct option.
A) 12  B) 14  C) 20  D) 13  E) 21
total no of boys=l+r-1=12+4-1= 
<gadget id="calculator">12+4-1</gadget>
<output>15</output>
15   we required 28 boys so we have to add 13 to make it 28.   so 13 is answer   ANSWER:13
<result>D</result>
If Rahul finds that he is 12th from the right in a line of boys and 4th from the left, how many boys should be added to the line such that there are 28 boys in the line?