Clearly number of boys in the line = (11 1 3) = 15.Therefore number of boys to be added = 28

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If Ajay finds that he is twelth from the right in a line of boys and fourth from the left, how many boys should be added to the line such that there are 28 boys in the line?

Clearly number of boys in the line = (11 1 3) = 15.Therefore number of boys to be added = 28