In a row of thirty children M is sixth to the right of R who is twelfth from the left end What is M’s position from the right end of the row ?
There are 11 children to the left of R and M is 6th to the right of R. Thus, M is 12 + 6 = 18$$^{th}$$ from the left. Since there are 30 children in total, there are 12 children to the right of M. Thus, M is 13$$^{th}$$ from the right.
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