Sharma's house and Varma's house le in same row Sharma's house is 9 from left end and varma's house is 17th from right end If these two interchanges their houses, Sharma's house will be 20th from left end. how many houses are in that row?
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In a row of houses sharma is 13th from the left. houses before Sharma=12 boys varma is seventeenth from the right.Boys after Varma=16 houses
In the same row Sharma is eleventh from the right=10 houses after him.
Therefore, total number of houses in the line=12+1+10=23 boys
Thus number of houses ahead of Sharma=23-16-1=6
Varma's house will be 6+1=7th rank
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