In a row of persons D is 7th from left and R is 12 from right. If D and R interchange their places, D would occupy 22nd place from left. find how many boys are there?

• Answer is: 33
  D's position is 22nd from left
  The same position if counted from the right is 12
  This means there are 11 boys sitting next to D
  Thus No. of boys=22+11=33
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